Update.
For a few days, right when he came in from outside, I had him immediately wash hands and go to his private table. He started to cry and beg to go to the other table, and I just said "You're eating in here today". He ate his lunch, he had book time at his table while everyone else had book time and went potty. After everyone finished, he went potty and to bed.
The Lunchtime Show and bad table manners have decreased to almost none, and he's been allowed back at the community lunch. The first episode will land him back at his own table.
The bad news is someone else has filled his spot, except instead of silly antics...we have screaming tantrums!! Same consequences, except he doesn't take it very well
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Thanks ladies.