The organisers of The Open in Portrush have warned workers to be aware of possible bonfire "disorder" and "a risk of disruption" from Orange parades.
Employees at the golf championship have been asked to "avoid displaying football colours" and to "be sensitive to any conversations in public regarding Northern Ireland politics or the Troubles".
In fresh guidance seen by The Irish News after it was issued some weeks ahead of the 148th Open Championship, organisers said bonfires "have previously led to a degree of disorder" and parades could bring a "risk of disruption... particularly where there are counter-demonstrations".
Golf fans coming to Northern Ireland have been urged by the Orange Order to sample the Orange as well as the greens as they try and drum up support for a new drive to attract tourists.
The leaders of the Order are trying to encourage visitors arriving early for the event, which is taking place from July 14-21, to swing by the Twelfth of July celebrations.
In a memo entitled 'Message to all Contractors and Service Providers to The Open 2019', organisers issued new advice.
It read: "Avoid displaying football colours. It is also recommended to be sensitive to ... NI politics or the Troubles."