The San Marcos High School Jazz Band. (Santa Barbara). I first heard this band by accident. I went to see a friend's rock band playing a fundraiser dance and it turned out that the fundraiser was for a high school jazz band that played a few numbers between the sets. They won me over immediately by beginning with "Motin Swing".
Last night they gave a concert at a 600 seat theater where usually I see someone like Charles Lloyd. It's a large band: (8 saxes, 6 trombones, 5 trumpets, 4 pieces rhythm section with 4 rotating pianists, 2 rotating drummers, an electric bass alternating with a stand up bass and one guitar. So about 30 young people (about 1/3 female including two who doubled on baritone and flute) playing swing and modern big band jazz very well and having a great time.
Numbers included "Motin Swing" again, "Well You Needn't" and several more recent pieces I didn't recognize.