• The Blues Project performs at 7:30 tonight at Rancho Nicasio at 1 Old Rancheria Road in Nicasio. Admission is $34. Dinner reservations are from 6 to 8 p.m.; dinner is not included in the ticket price. Go to ranchonicasio.com.

• Ralph Woodson and Purple Haze pay tribute to Jimi Hendrix at 8 tonight at Sweetwater Music Hall at 19 Corte Madera Ave. in Mill Valley. Admission is $33.48. Go to sweetwatermusichall.com.

• Mayflower Chorus presents its spring show of music and dance at 8 tonight and 2:30 and 7:30 p.m. Saturday at Marin Center’s Showcase Theatre at 20 Avenue of the Flags in San Rafael. Admission is $12 to $29. Go to tickets.marincenter.org.

• This year’s Marin Irish Festival is from 10 a.m. to 6 p.m. this weekend at Lagoon Park in San Rafael. Admission is $15 to $30 per day. Go to tickets.marincenter.org.

• San Anselmo Library’s Sustainability Fair is from 11 a.m. to 1 p.m. Saturday on the library lawn at 110 Tunstead Ave. in San Anselmo. Admission is free. Go to townofsananselmo.org.

• “Buggin’ Out” is the theme of this year’s Valley Fest from 2 to 6 p.m. Saturday at Lagunitas Community School at 1 Lagunitas School Road in San Geronimo. Admission is free. Go to leap4education.org.

• Marin Stargazers hosts a star party with telescopes for public use at 8 p.m. Saturday at Piper Park in Larkspur. Admission is free.