Op,
DD did advanced digital filmmaking at US Performing Arts at UCLA for 2 wks and had a good experience.
If you go onto the search portion of cc and type in summer film programs, there are many threads on this question.
Here is a thread that I started many years ago, when looking for a film program for DD when she was a soph.
Off the top of my head,
there are college ones that are expensive: NYU Tisch, USC, Chapman, Northwestern, and a ton of others.
Private ones that are expensive: SOCAPA, NYFILM Academy.
Art colleges that have summer programs: SCAD, Art Center College of design etc
Private cheaper programs: Digital Media Academy, ID tech camp, US Performing Arts (Taught by UCLA Film and TV faculty): these are good because they only last 1 or 2 wks.
Arts camps: Idlywild, Interlochen
Too many to count!