OK, so it's been busy at the ballet. BalletMet Columbus' 30th season starts this fall with "30x30," a significant undertaking featuring 30 new pieces by 30 different choreographers. The company's Dance Academy will open a second location in Gahanna later this summer. And three new dancers - David Tai Kim, Jaime Kotrba and James Pierce III - have joined the company. Oh, and the company will perform in the City of Columbus Parks and Recreation-sponsored Rhythm on the River series on Aug. 31.