Friday, the Club 2 Club Festival returned to New York for a second consecutive year. Founded in Turin in 2002, the music fest ventured into North America with a one-day event at Knockdown Center in Queens last spring, reprised this year at the same venue ahead of the 25th anniversary edition of C2C’s flagship Italian event this fall. C2C bills itself as a showcase of both established tastemakers and up-and-coming critical favorites in the realm of experimental pop and club music. These genre markers are, of course, already tenuous, as most genre markers are — I don’t know what clubs people are going to where the DJs are playing Elias Rønnenfelt and Los Thuthanaka — but the looseness of terms like "avant-pop" (which C2C uses in their promotional copy) doesn’t leave their lineup feeling vague or incohesive. Instead, it lends the festival a note of curatorial expansiveness.…