The Green Party has formally requested that Belfast Council remove the standard charge for an LGBTQ+ event scheduled to take place at Belfast City Hall.
This gathering is part of a wider UNISON LGBT+ conference weekend currently being held at the International Convention Centre.
Attendees are expected to number around 200, with the programme featuring a drinks reception and several speeches.
UNISON represents the UK's largest trade union, covering sectors including the NHS, local government, education, police, utilities and the voluntary sector.
The request for a fee waiver follows a period of heightened tension regarding the use of council buildings for such events.
Last October, a dispute arose when pro-Palestine messages were displayed at the Waterfront venue during an event attended by high-profile Sinn Féin figures.
That incident led to the council agreeing to draft a new framework governing display materials across its estate.
Earlier this year, further unrest occurred in the Great Hall after an official portrait of former Lord Mayor Lord Wallace Browne was ripped from the wall and the glass frame shattered.
The disruption happened immediately following a 20th-anniversary celebration for the West Belfast Irish-language group Glór na Móna.
During those earlier discussions, council officials suggested exploring alternative solutions that might satisfy all parties without necessarily waiving the fee entirely.
Following prompt dialogue with the organisers, the venue reversed its stance and allowed the graphics to remain visible for the duration of the event.
The Green Party maintains that it is a matter for the committee to decide on the waiver of the room hire fee.
No further details regarding the final decision have been released at this time.