It’s your last chance to catch an astronomy program on Mt. Tam before spring of next year. This weekend, Planetologist Dr. Kevin Zahnie talks about the collision of Earth with another world gone wild that caused the extinction of dinosaurs and everything else. (And it could happen again!) The best part of this evening is the opportunity to view through telescopes provided by the San Francisco Amateur Astronomers. Good timing as Jupiter just returned to the night sky and Mercury enters retrograde starting on Monday (watch out!). Rock Springs Parking Lot, Mount Tamalpais (Mill Valley), Sat, 11/3, 7 p.m.

Eve Ensler's famed play The Vagina Monologues starts a one-week run at the Sweetwater Music Hall. Various women perform different monologues all relating to the female experience which includes (but is definitely not limited to) sex, periods, birth, orgasm, and the fact that the vagina is a powerful tool. Sunday 11/4, doors @ 3 p.m., show at 4 p.m. $22, 19 Corte Madera Ave, Mill Valley. Plays through 11/11.

One of the best reasons to head to the 'burbs is to go the mall, and this weekend you'll get an extra treat in the Village at Corte Madera. Microsoft will open its third Bay Area store on Saturday (yes, Microsoft, not Apple). The grand opening fanfare includes a Kelly Clarkson concert on Saturday (!) and an appearance by 49ers wide receiver Jerry Rice on Sunday. The first 2,000 people in line at the new store will be given a premier viewing wristband, and the first 1,000 will get to meet and greet Kelly Clarkson. More details here. Line up at 2 p.m., gates at 4 p.m., concert at 6 p.m. Village at Corte Madera, 1618 Redwood Highway.