A user on reddit (quantumzak) has found the Crystal Gems hanging out in the current issue of the Giant Days comic! While Daisy, Susan, and Esther go to a music festival, it seems they walk past our beloved crystal warriors. Giant Days #19 is where you can find this scene. Giant Days is a comic written by John Allison with art originally provided by Lissa Treiman and later picked up by Max Sarin.
(And if I, Little Ursa, can be honest, this is one of the best Boom Studios comic around, next to Lumberjanes.)