Tomorrow, at least for people who use the completely nonsensical American version of date notation, is 3/14 – Pi Day! San Francisco has the dual advantages of (1) making anything into an excuse for a party and (2) being just a bit geeky. There are so many places to celebrate in the city tomorrow!

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The Exploratorium will be hosting it’s 25th Annual Pi Day Celebration at their new location near Pier 15. According to their site, “We’ll serve up slices of pie, share pi-related activities, host a Pi Parade, and ceremoniously install our new Pi Shrine into a fittingly circular site outside Pier 15.

In addition, we are excited to present Pi in the Sky by ISHKY in collaboration with AirSign. At 10,000 feet above our new building, a team of five synchronized aircraft equipped with dot-matrix technology will skywrite the first 1,000 digits of Pi’s infinite sequence (weather permitting), offering an ephemeral, elevated experience of the famous transcendental number.”

The California Academy of Science has a specially-themed NightLife: “Celebrate the glory of pi and pie with a night of mathematical merriment, and pie tastings and demonstrations. Get irrational in the “pi zone” with fun math activities from UC Berkeley’s Mathematical Sciences Research Institute, then grab a hula hoop and contemplate the ratio of its circumference to its diameter as you gyrate. Rationalize the nutritional value of a slice in the “Pie Zone” with samples from Whole Foods and Peasant Pies, a pie-making demonstration by the Academy Cafe, and an activity from the dough-wranglers at Pie Ranch. In the planetarium, learn about the unheard music of planetary motion in a special presentation titled Music of the Spheres at 6:30, followed by two showings of Earthquake. Music by the DJs of LoveTech.”

Just want some Pi-inspired food at a discount? Both Mission Pies and Paxti’s Pizza are offering slices for $3.14 if you’re hungry.

And, of course, the masses will descend upon Pi Bar on Valencia. Open at 3:14pm.