Weekend events in the Ponca City area. Friday Volunteers are needed at the Ponca Playhouse from 6 to 8 p.m. to paint the floor. The 143rd annual Ponca Powwow will begin at 7 p.m. in White Eagle. Stacey Sanders will perform at Astoria Blvd. and Bistro from 8 to 11 p.m. Biskett will perform at The Fox at 9 p.m. Saturday Ponca City Farmers Market will be held from 8 to 10:30 a.m. at the Pioneer…