Umphrey’s McGee and STS9’s co-headlining tour continued over the weekend. As the summer outing winds down, the sit ins have not only continued but also increased.

On Friday, STS9 and Umphrey’s McGee appeared at Philadelphia, PA’s Skyline Stage at the Mann Music Center. Umphrey’s McGee closed the night, and STS9 bassist David Murphy emerged for a take on “Wappy Sprayberry” near the end of their set (For the early part of the tour, both bands only opened up their stages for sit ins during the night’s encore.) Then, STS9 drummer Zach Velmer joined Umphrey’s McGee for a cover of Fugazi’s “Waiting Room” during the show’s traditional encore sit in spot.

Last night, the tour rolled into Boston, MA’s Bank of America Pavilion, and STS9 closed the evening. For the run’s penultimate show, the sit ins started early, however, when Umphrey’s McGee brought out STS9 percussionist Jeffree Lerner and keyboardist David Phipps for a cover of Warren G and Nate Dogg’s “Regulate.”

STS9 also invited out members of Umphrey’s McGee during their closing slot. Instead of bringing out members of the group for their encore, STS9 invited out Umphrey’s McGee guitarists Jake Cinninger and Brendan Bayliss, percussionist Andy Farag and bassist Ryan Stasik for a take on The Rolling Stones’ “Sympathy For The Devil” at the end of their encore.

The co-headlining tour will come to a close at Vienna, VA’s Filene Center at Wolf Trap this evening.

Here’s a look at this weekend’s setlists as they appear in our Box Scores section

Umphrey’s McGee, Saturday, August 31, Bank of America Pavilion, Boston, MA

Plunger > Walletsworth, Crucial Taunt, The Pequod, The Linear > Glory > Deeper, Divisions > Soul Food II > Divisions, No Diablo, White Pickle > Regulate*, Mulche’s Odyssey

*with Jeffree Lerner on percussion and David Phipps on keyboards

STS9, Saturday, August 31, Bank of America Pavilion, Boston, MA

Hubble, Simulator, Abcees, Circus, Kaya, Glogli, Grow, Rent, Aimlessly, The Rabble, Inspire Strikes Back, Sympathy For The Devil*

*with Jake Cinninger, Brendan Bayliss, Andy Farag and Ryan Stasik

STS9, Friday, August 30, Mann Music Center Philadelphia, PA

Metameme, Vapors, What is Love?, Really what? > 4 Year Puma, Scheme, Vibyl, .F Word, Golden Gate, 20-12, Move My Peeps, MOD, Awesome feat. Cool Kids (STS9 Remix) > Unquestionable Supremacy of Nature, Breathe In, Wika Chikana

Umphrey’s McGee, Friday, August 30, Mann Music Center Philadelphia, PA

Gurgle > Slacker > Ocean Billy > Day Nurse > Ocean Billy, All in Time, Shine on You Crazy Diamond, >Wappy Sprayberry* > JaJunk

E: Waiting Room^, Pay the Snucka

*with Dave Murphy; ^with Zach Velmer