Event organizers that treat reenactors as lower class participants is a turn off... "thanks for coming but you can park two blocks away.... These lots are for the paying public."
Event organizers who frown on weapons or blackpowder use by the reenactors. Let's sterilize the event... get a rasberry!
Water, boats and open space is a plus.
Hotel/motel deals are a plus... the other half isn't into camping.
A 'stand-offishness' by some crews/camps create an air of elitism that I can do without.