This years MAA MathFest is in Tampa Florida, which is not a good place to be LGBTQIA+. The linked open letter asks the organizers to provide an online option, and be more honest in their messaging.
Email template and emails to reach out to appear at the end.
When the main ruby (programming language) conference was held in Houston last year there ended up being a small split off conference in Rhode Island to ensure everyone had a conference they felt safe attending. Might be a good option for the math community.
https://www.rubyconfmini.com/
Separate but equal, right?