I use parks mostly for wedding venues with a custom lot trait for wedding venue, but that also means dealing with random sims not at the wedding. I tried to use Natural Park for one, but for unknown reason that isn't allowed (stupid). I'm looking forward to the new venue type.
Now if I were running the game, all venue types would be possible to use for all types of events, leaving it up to the players what they want to do. But then if I ran the game, lot types would also be combinable through lot traits and service sims would show up on all community lots if there was something there for them to show up to.