The Pomona Jazz Ensemble is losing 3 senior trumpet players this spring. They are going to need replacements. Probably a plus on your application. The director’s name is Barb Catlin. There is contact info on the Pomona website. Here is video from their last concert:
https://www.youtube.com/watch?v=3_NO2jruAtI&t=5s
Skip ahead to 4:05 for the music. Some great trumpet solos if you listen through the whole thing.
You can joint band if you attend any of the 5C’s.