FRIDAY: >> Potty Fest? Not really, but it’s called POONanza. It’s actually a comic variety show named after the host, Larry Poon. A Washington native, Poon grew up in the tough “CrackLand” housing projects in Southeast. Debuting on stage back in 1999, he’s haunted countless area-comedy shows, and will perform POONanza III tonight at Warehouse Theatre. We’re not really sure what the roman numerals signify, but he promises POONification. We’re intrigued. Check out the man’s…