This is the first I have heard of this.... realistically, it all depends on the venue. I think every parade I have been a part of they never had an issue with it. They recognized that the props go with the costumes.
Schools and venues like OryCon are a different scenario. Obviously we don't tote our blasters in a school event for the obvious reasons (guns + schools = bad mojo). OryCon are just uber anal about their weapons and mask policies. They are loosening up on the mask policy a little bit as each year goes by, but their weapons policy is still deeply rooted.
I'm sure if there were a weapons restriction, the event coordinators would let us know about it. At least that is something that our PR guy could follow up with.
- Bill