I've given this some thought and have come to the conclusion that not allowing spectators in is total B.S. So far I haven't seen one legit excuse. Limiting the number of is acceptable and understandable. Forcing would be spectators to volunteer is kind of a chicken **** move if you ask me. If finding a free work force is a challenge then the event planner isn't really doing their job very well or giving it the attention it deserves. This move has sent out one huge negative vibe to a community that is the core customer. Way to go!
It's a real bummer that anyone who wants to attend will have to work with an invited participant or work parking cars in order to catch a glimpse of things. Hey....you might not be able to buy a ticket to attend the event...but I'm sure they will have a video for sale.