The finalists of this month's Showdown in Chinatown Championship film competition will be screened at the Island Independent Film Festival at 8 tonight. The grand prize: $1,000. The vibe will be raucous. Then DeShannon Higa and his grOOve.imProV.arTiSts take the stage. It all happens at NextDoor, 43 N. Hotel St., 548-6398. Tickets: $20. www.showdowninchinatown.com.