John Kadlecik will host the Summer Solstice Jam at Gyspsy Sally’s in Washington, DC from June 21st – 24th. The guitarist, who used to play lead guitar with Bob Weir and Phil Lesh’s Grateful Dead spin-off band Furthur, will join forces with keyboardist Melvin Seals, drummer Jay Lane, bassist Robin Sylvester, and backing vocalists Jessica Lake and Mary Lankford for four shows.In addition to co-founding Furthur with Weir and Lesh, Kadlecik also co-founded popular Grateful Dead tribute act Dark Star Orchestra, though he is no longer a member of the band. These days, he plays with the John Kadlecik Band, the Golden Gate Wingmen, and a variety of other projects.Kadlecik won’t be the only person on stage with connections to the Grateful Dead. Seals, who co-founded The Mix with Kadlecik in 2004, performed with the Jerry Garcia Band for over 15 years and continues to play the group’s music with his Melvin Seals and JGB project. Lane—who is also a member of Golden Gate Wingmen—and Sylvester are both current members of Weir’s post-Dead project RatDog (and Lane was even one of the early drummers for Primus).Tickets for the Summer Solstice Jam are now on sale. Fans can expect to hear plenty of jams and tunes from the Grateful Dead and Jerry Garcia catalogs. Each night will feature two sets.In related news, Kadlecik was just added to the lineup for the inaugural Waterloo Festival in Austin, TX. He’ll be performing with Oteil & Friends, a group led by Dead & Company bassist Oteil Burbridge.