There are 20 parades - 18 Orange Order demonstrations and one Independent Loyal Orange Institution event in Northern Ireland - along with the long-standing demonstration in Rossnowlagh in Co Donegal, being held tomorrow.
Tens of thousands of Orangemen, women and child members will be taking part, supported by some of the best marching pipe, flute, silver and accordion bands that the province has to offer.
Many thousands of people will line towns and villages as the parades leave gathering points ahead of making their way to their chosen demonstration field, where the traditional religious service and proposal and adoption of this year's resolutions will take place. Monday's celebrations will mark the 325th anniversary of the Battle of the Boyne, where King William of Orange defeated King James on the banks of River Boyne in Co Meath. King William himself will be making two guest appearances, leading the parades in Kesh, Co Fermanagh, and Antrim.
One of the more eye-catching events should be a 50m dash - complete with bowler hats and collarettes - at the Fivemiletown event on the Tyrone/Fermanagh border to find the fastest Orangeman in the west before the parade proper.
In Belfast, Stormont will be lit up using orange and purple lights to mark the occasion.
Organisers are encouraging the return of the 'Twelfthie' and asking parade participants and spectators to use their smartphones and tablets to post their pictures on social media to capture the carnival atmosphere.
FIRST RESOLUTION - THE FAITH
As members of the Loyal Orange Institution we give thanks to God for His salvation, planned by God the Father, purchased by God the Son by His substitutionary sacrifice on Calvary and applied to sinners by the work of the Holy Spirit.
As Bible-believing Protestants we declare that while salvation is received by faith alone, it leads to a life of humble obedience to the law of God.
We regret the increasing opposition to God's Word and the determination to deprive Christians of their liberty.
We call on all Orangemen to stand fast and to live lives that glorify God.
SECOND RESOLUTION - LOYALTY
That we, the Orangemen do hereby reaffirm our devotion and loyalty to the Throne and Person of Her Most Gracious Majesty Queen Elizabeth II.
We note that on September 9, 2015, DV, Her Majesty the Queen will become the longest serving British monarch. We reflect on a reign which has been marked with dignity and service to her people and express our profound indebtedness to her.
The Institution also appreciates the role played by the other members of the Royal Family and expresses thanks. We congratulate the Duke and Duchess of Cambridge on the recent birth of Princess Charlotte.
THIRD RESOLUTION - THE STATE
We cherish the Union. We welcome the outcome of the Scottish Referendum of September 2014. We urge our political representatives to stand firm.
We are mindful of brethren subject to attacks on their property and attempts to prevent their parades. We call on those who protest against us to show tolerance. We remind everyone that peaceful protest remains our best means of opposition.
In this 40th anniversary year of the massacre of five Orangemen at Tullyvallen in County Armagh we bring to mind all our brethren who lost their lives through terrorism. They will not be forgotten.
As we look to the centenary of the Somme, we are reminded of the sacrifice many Orange brethren made during the First World War. We pledge to commemorate them with pride and dignity in 2016.
Rossnowlagh, Co Donegal,
Saturday, July 11
Fifty lodges from Donegal, Cavan, Leitrim and Monaghan and 30 bands will take part. They include Convoy and Newtowncunnigham, where both halls were destroyed by arson since last year. The 3pm service will be conducted by Rev Brian Russell. Guest speaker Harold Henning, deputy grand master, will be joined by Co Donegal grand master David Mahon and other senior brethren.
Bessbrook, Co Armagh, Monday, July 13
Almost 5,000 brethren and 15,000 spectators will enjoy what is seen as the largest gathering of Orangemen on the day. There will be 11 district lodges, 154 private lodges, ladies from the Women's Institution and junior lodges. More than 80 pipe, accordion, flute and silver bands - including the local Crimson Arrow Pipe Band and Bessbrook True Blues Flute band - will parade.
Assembling at Bessbrook Orange hall at 8am, the parade will go to the Kingsmills Memorial for a short service to commemorate the 10 local Protestant men murdered by the IRA in 1976.
The guest speaker will be grand master Edward Stevenson. The first of the bands will leave from 3pm.
As Stormont lights up orange to mark the 325th anniversary of the Battle of the Boyne, Belfast will host one of the largest annual Twelfth demonstrations. More than 60 bands and nine districts will take part in the parade which, in keeping with tradition, will take up position from 9.45am at Carlisle Circus before moving at 10am from Clifton Street, Donegall Street, along Royal Avenue to Belfast City Hall. Following an act of remembrance at the Cenotaph, the parade will move off at around 10.40am from City Hall up the Lisburn and Malone Roads to the field at Barnett Demesne.
Platform proceedings start from 2.45pm where the chairman for the afternoon will be county grand master George Chittick with the address by Rev William Malcolmson, deputy county grand chaplain.
The parade will make its way from the field towards the city centre from 4.15pm.
Spectators will be treated to King William himself on horseback leading the procession.
He will be joined by an honour guard of people in military uniform in tribute to those who lost their lives in the First World War.
They will be followed by the county standards, including the memorial bannerette bearing the names of 31 members in the county murdered by terrorists.
Around 90 lodges from 15 districts will be joined by 70 bands.
Turbid True Blues LOL 200 band will also celebrate its 150th anniversary on the day.
The parade will move off at 12.30pm from the assembly field on the Ederney Road before proceeding to the field, where the religious service will start at 2.30pm. Main speaker will be Rev Dean Raymond Thompson with county grand master Stuart Brooker as chair.
Coleraine will play host to Henry Dunbar, the most senior Orangemen in Scotland, as 60 lodges and 50 bands provide the largest Twelfth parade in Co Londonderry.
Members of Coleraine district will be joined by brethren from Limavady, Derry, Macosquin and some lodges from Donegal.
The parade will assemble at Killowen Street at 11.30am before making its ways to the demonstration field at the Showgrounds.
Mr Dunbar will deliver the main address while the proceedings will be chaired by Coleraine grand master George Duddy.
Over 60 lodges from eight districts will be supported by up to 50 bands, moving off at 11am.
The districts will gather at Fairhill before moving to the field on the Moneyhall Road.
Platform proceedings start at 2pm, led by Londonderry county grand master Hugh Stewart, with the return due from 3.45pm.
Up to 50 lodges and as many bands will file past the famous Holywood maypole as the seaside town hosts the annual North Down Twelfth demonstration.
Thousands of spectators are expected to line the town's streets from Redburn Square where the parade will start at 12 noon before making its way to the field at Ballymenouch Park. Deputy grand master of the Grand Lodge of Ireland Harold Henning will deliver the main address, while Rev David McIlveen will officiate at the religious service.
The return parade will start from 4.15pm.
Five districts with 70 lodges from Saintfield, Comber, Ballynahinch, Lecale and Castlewellan will be on parade with 40 bands in what organisers intend to be a family-orientated occasion. The procession will start at 12.30pm with the main parade moving from the Old Belfast Road through the village to the field at Station Road. Guest speaker will be past County Down grand master Victor Harrison.
The small village outside Banbridge is expected to attract up to 20,000 people for the largest demonstration in Co Down.
Over 100 lodges and 80 bands will make their way from Huntley Road, Banbridge, at 12 noon to proceed to the field on the Gilford Road. The religious service starts at 2.30pm, officiated by Rev Hugh Ross with main address from grand secretary Drew Nelson, with the return parade starting from 3.45pmn.
One thousand Orangemen from the Mournes will step out in one of the smaller demonstrations. Fourteen of the 15 lodges will be accompanied by their own bands as the parade leaves Kilkeel Orange hall at 10.45am to the demonstration field at Pat's Road near Ballymartin.
Platform proceedings start at 2.30pm with the return parade starting at 4pm.
Large crowds are expected in the small village as seven districts provide the spectacle of 70 lodges with over 50 parades. It will leave Derryfubble Road at 12.30pm to the field where the religious service will start at 2.30pm.
Over 5,000 people are expected to take part. Members of 55 lodges from Omagh, Sixmilecross, Newtownstewart, Killen and Strabane will be accompanied by pipe and flute bands.
The parade departs from Ecclesville Park at 12.30pm to parade around the town before returning for the religious service.
This will include a 50m dash of Orangemen in full regalia including bowler hats and collarettes, to find the fastest Orangeman in the west. This will be a cross-border affair involving 25 local lodges with several from Co Monaghan. Parade leaves St John's Hall at 12.15pm to Fivemiletown College. Platform proceedings start from 2.15pm.
Another King William on horseback will lead the parade of 8,000 members from 70 private lodges and 60 marching bands.
Parade starting point is Fountain Hill at 11am to make its way to the demonstration field.
Ballymena - the only town in Northern Ireland to host a Twelfth celebration every year - will host 30 lodges and 15 bands.
Parade start is Waveney Road car park at 12.30om before it makes its way to the field at Ballee Road West.
Ron Bather, grand master of the Grand Lodge of England, will be the main speaker at the field at Fullerton Park in the south Belfast event. Some 70 lodges from seven districts will be supported by 40 bands as the parades leaves Queensway from 11.30am.
The only Twelfth event to cross two counties. Sixteen lodges will start their parade in Cullybackey, Co Antrim, from 12.30pm before going to the field on the Clady Road, Co Derry.
Holidaymakers are expected to be in the crowd enjoying the parade of up to 50 lodges and 30 bands. Districts represented will be Ballymoney, Ballycastle, Rasharkin, Cloughmills as well as Bushmills. The parade starts off from Castlecatt Road at 1pm onwards to the field at Whitepark Road.
Orange lilies will be out in bloom in one of Northern Ireland's most picturesque villages for the Braid Twelfth. Some 350 Orangemen from 11 lodges will be accompanied by nine bands. The parade leaves at 12 noon from Tullymore to make its way to Beechvale before returning to the community centre for the religious service. Ukip spokesman and Orangeman Bob Stoker will be the guest speaker.
The Co Antrim town will host the Independent Loyal Orange Institution's only demonstration, which starts with a prayer service at St John's Presbyterian Church in memory of one of its founders, Rev D D Boyle.
Platform proceedings start from 2.30am where Social Development Minister Mervyn Storey will propose the resolutions.