Rainbow Skate: As if rollerskating couldn't get any gayer, Redwood Roller Rink has made Wednesday nights exclusive queer. So tonight, gay, lesbian, bisexual, transgender, and even a smattering of straight folks come together to whirl around the rink. Starts at 8 p.m.; $7 covers both admission and skate rental.Benefit for the Metropolitan Arts and Technology's Drama Program: Help the kids won't you? Metropolitan High -- you know, that large school on Treat Street, targeting......