If you want to stay on the right side of this stuff, you should keep track of who the in-groups are in progressive ideology, and who the out-groups are. We don't have this presumption in most spheres of life. And I thik harassment is very very likely if the convention is mostly male because the activity is one traditionally associated with traditional idea about masculinity. Where is this coming from?
Bookstores would have to be repurposed as yoga studios, and movie theaters as hipster churches. As we all are aware, advertising companies place great value on obtaining accurate data on various demographic groups.