It's Godwit Days in nearby Arcata, a week-long festival to celebrate the migration of shorebirds. The 20th is the traditional day for the migrating orioles to show up. I couldn't time this better if I tried.
4/20 is also a traditional date for cannibis people, and since Humboldt County is the acknowledged premier location, festivals are planned throughout the region. Nearby Humboldt State College, not known for it's academic achievements, will likely declare it a holiday. There is no way I'll miss 420 in Humboldt, a truly unique festival.
Plenty of things happening here; I'm happy.