Event run by whom, based on which politics? Is it impartial, and to what end? Or is it a political rally for a specific view? In which case yes, there's a lot of concern around homophobia, removal of LGB rights and definitions, exclusion of LGB people from their own events and organisations unless they are politically partisan and willing to basically stop being homosexual.
I'd check. It's then a question of whether you feel safe and able to raise some questions like 'I'm aware of come controversy here and the concerns of many LGB people, and it would be easy to innocently go along with something without question which in fact may be supporting homophobia and actively alienating or offensive/distressing to LGB colleagues, and make them feel unable to be out at work, should we do some research into this? Like why Simon Fanshawe's abandoned Stonewall and his explanations of why? And what members of the public might be afraid to use us if we're declaring a political position that for example subordinates and rejects the inclusion and access of women with Autism, women of different faiths and cultures, women who have experienced CSA/DA/DV, lesbian women? Should we be worried about taking a controversial and exclusionary stance as a political position, particularly with court cases in the pipeline that may mean those women sue the living daylights out of us for breaking the law that certain lobbies have misrepresented in their glittery marketing? Or should we focus on being impartial and accessible to all with no affiliations?'
Or if you don't feel safe - and who could blame you, the fear and coercion and intimidation and punishments involved is one of the very nastiest bits of this lovely, happy, 'loving' and 'kind' political agenda and its supporters - then as pp says. I would be unfortunately ill that day. What a pity. Oh dear. Hope you all had a lovely time.
It may eventually dawn on employers that gay and female employees would rather lose a day's pay or actually have a stomach bug than have to face events supposedly lovely and inclusive and celebrating them. And that their customers are going to take note of political bias too.