BADA runs several summer camps for ages 8-14 which many players have enjoyed in the past: https://bayareadisc.org/en_us/summer-camps

This summer Alameda Parks & Rec is running some ultimate camps for ages 7-13:
https://anc.apm.activecommunities.com/alamedarecreation/activity/search?onlineSiteId=0&activity_select_param=2&activity_keyword=ultimate&viewMode=list

The Oakland Spiders are also running camps:
https://oaklandspiders.com/pages/summer-2025-youth-camps

There's also CUT Camp (Competitive Ultimate Camp) for ages 14-18 (6/22 to 6/27):
https://competitiveultimatetraining.com/