If you’re in the Americas, Europe or Africa, remember to check out the total eclipse of the moon (the Earth’s shadow falling over the full moon) tomorrow night. Totality is at 8:40pm PDT / 11:40pm EDT, and all you need is a clear view of the moon to the southeast (it’ll be just rising on the West Coast, so you’ll need to be able to see down to the horizon). It’s entirely safe — you’ll be looking at the moon, not the sun.
More info:
Lunar Eclipse Computer (time, azimuth, altitude for any location)
San Francisco Bay Area suggested viewing spots and more San Francisco Bay Area suggested viewing spots