I'm going to a professional conference the weekend after the general election (bought tickets before the election was called).
As soon as the election was called, the organisers started talking about what a shame it is and how we would all "need alcohol" and "be in need of cheering up" after the election, basically making clear they assumed everyone would be voting Labour/left and be sad about losing. They've been periodically posting anti-Tory stuff since.
Over 250 people go to this event and I'm sure we are not all Labour voters. It's a professional/industry event and for the most part I try to keep politics out of my work context (no reason to burn bridges with potential clients, after all). But now I feel like the event is going to have a political undertone and I can either pretend I vote Labour, or be honest and risk alienating people who I might work with in the future.
If I hadn't paid nearly £200 for the ticket, I probably wouldn't go at all now. I get that it's their event and they can do what they want but I feel totally unwelcome now and annoyed about it all.