PREVIEW RAWdance's Concept Series is the brainchild of dancer-choreographers Ryan T. Smith and Wendy Rein, who needed a lab situation in which to test concept and show works in progress. They invited friends and artists who looked interesting and who had similar concerns. The result is a series of informal presentations that sparkle with fresh ideas, although the individual works are rarely finished. Watching this type of dance is so inviting, despite the tiny, near-impossible performance space. It's long and narrow, and audiences must be prepared to move the furniture to accommodate a particular artist's requirements. Concept 5 looks especially intriguing. In addition to Smith and Rein's latest experiments, you'll get the inimitable Mary Armentrout; Bob Webb/Bare Bones Butoh — you probably know him better as the ubiquitous stage manager who keeps dance shows on track; improv dancers Christine Cali and Amy Stemstetter, freshly back from the East Coast; Printz Dance Project, who have their own show Nov. 5-7; and Lily Dwyer and Scott Marlowe, LEVY Dance members who are striking out on their own. Parking is tough, so patronize Muni. But the price is right: pay what you can — and the popcorn is free.

RAWDANCE PRESENTS THE CONCEPT SERIES: 5 Sat/5–Sun/6, 8 p.m. (also Sun/6, 3 p.m.), pay what you can James Howell Studio, 66 Sanchez, SF. (415) 686-0728.