The grand, official opening of Melbourne's sound and lighting extravaganza VALVE is on next Friday night.   There will be performances by Ricki-Lee, N’fa and DJs from 10pm.   $20 on the door or $15 if you rsvp to the 2Threads doorlist to adam: adam@baroqhouse.com.au.   Valve, 177 Greville Street, Prahran.