Quachella is a three day music festival that the Griffins attempt to attend in "Young Parent Trap".
When Peter and Lois ditch Meg and Chris to move into Millennial Village after being mistaken for a younger couple by Matt and Kate, the former move into the same apartment building to expose Peter and Lois as frauds. They suggest that everyone makes a road trip to Quachella. As Peter jokes about the Von Trapp family from The Sound of Music sticking around to collect their award, Chris notes to there will be holograms of Tupac and Nipsey Hussle there, although he admits he's never heard of them previously.
When they arrive at the festival, Peter and Lois realize they are in over their heads and confess there's a seat to Matt and Kate, but also point out that they were pulled by Meg and Chris posing as adults. Lois, unable to deal with Millennial life, curls up in Chris' shadow, while Peter manages to ruin his pants in the mirage of a 7-Eleven bathroom.