>        I agree, but, alas, our group was advised not to show an
> observation hive because yellowjackets often forage among the people at
> the fair. Aggressive yellowjackets give the bees a bad name.
 
I would have imagined that the idea would be to keep the entrance screened
and just show the bees off to passersby, especially at an outdoor market.
 
Otherwise one would have to wait until dark to get the bees back.  Or put
a bee escape (backwards) on the entrance an hour before packing up to
leave.
 
Allen