Don't let the threat of snow cause you to hibernate this weekend, here are some events to get you off the internerd and away from the TiVo. Tonight in Somerville at the Independent, the Mash Ave party goes off on its regularly scheduled night. For those who don't know, a mash up is DJ Dangermouse's remix of Jay-Z's "99 Problems" with the Beatles "Helter Skelter" on the Grey Album. Next Friday, Solcofn from DC......