filmo and quick said it,,it's widely accepted at all but "juried events"..the adjustable sights is the toss off. After market fixed sights are available from several distrubutors. I too have seen flint lock only,and it's all about portral of an event for "public" aka;flatlander veiwing. But they let GPR's in!
If you keep a low profile,,and try to keep other items pc (clothing,accuterments)(no plastic speed loaders,no sabots,no soda cans or water bottles) you'll be fine.