Here's an introduction to the acts appearing Thursday, July 1 at Top of the Park — the Ann Arbor Summer Festival's free, outdoor component, held outside the Rackham Building, on East Washington Street at Ingalls Mall. And don't forget the Top of the Park Photo Contest, presented by AnnArbor.com for the festival.

The KidZone Tent is open from 6:30-8 p.m.

The night's headline attractions:

Gemini Rackham Stage, 6:30 p.m.

This year marks Gemini’s 37th year of playing music together from their home base in Ann Arbor. The group will be performing their "Those Were the Days," concert of classic songs from the '60s. Come sing along with songs by Pete Seeger, Bob Dylan, Peter Paul and Mary, and more.

Performing since: 1974 Home base: Ann Arbor Style of music: Folk Members: San and Laz Slomovits (also performing with us at TOP, San's 16-year-old daughter, Emily, on violin and vocals; Aron Kaufman on drums; and Eric Fithian on bass) Pre-show ritual: Tune, and tune some more. Favorite road food: Chocolate (on the road and at home). Desert island disc: Allman Brothers "Live at the Fillmore" Best thing about Ann Arbor: What's NOT to like?

More info: Website

Listen to Gemini "Noah's Ark" (MP3).

Madcat, Kane & Maxwell Street Rackham Stage, 8 p.m.

Grammy award winning harmonica player/vocalist Peter Madcat Ruth and guitarist/vocalist Shari Kane have been playing music together for 20 years. Their first gig was at the Ann Arbor Summer Festival’s Top of the Park on July 1, 1990. Twenty years later, they are still at it, and sounding better than ever. This special performance marks the duo’s 21st consecutive performance at Top of the Park. They will be accompanied by bassist/vocalist Mark Schrock and drummer/percussionist Mike Shimmin.

Performing since: First gig was TOP, July 1, 1990, exactly 20 years ago. Home base: Ann Arbor Style of music: Acoustic blues / Americana Members: Peter Madcat Ruth, harmonica and vocals; Shari Kane, guitar and vocals; Mark Schrock, bass; Mike Shimmin, drums. Pre-show ritual: Get there early to get set up, and then relax! Favorite road food: Zingerman’s pastries. Desert island disc: Best of Little Walter Best thing about Ann Arbor: We live here, it’s home.

More info: Website

Listen to Madcat and Kane "I'm Doing Alright" (MP3).

Movie: "Plan 9 From Outer Space" (1959, not rated, 79 minutes)

Often considered one of the worst movies ever made, this Ed Wood "classic" focuses on extraterrestrial beings seeking to stop humans from creating a doomsday weapon that would destroy the universe. In the course of doing so, the aliens implement "Plan 9", a scheme to resurrect Earth's dead as zombies to get the planet's attention, causing chaos.

Watch a clip from "Plan 9 From Outer Space":

Each Thursday, the Ann Arbor Film Festival will screen short films from its archive before the Top of the Park main feature. Tonight features "The Complete Truth About De-Evolution" by Chuck Statler. This music video for the band DEVO won an award in 1977 at the Ann Arbor Film Festival. It was screened on the festival's traveling tour and helped Devo get signed to their first record label. Filmed in 1974, this music video contains two separate songs: "Secret Agent Man" and "Jocko Homo." DEVO appears as a Summer Festival mainstage show on July 6.