OCCHacks Costa Mesa, CA, USA OCC's Third Hackathon — 30 Hours, One Project $2,000 in prizes Oct 10 – 11, 2026 101 participants
Spookathon 2025 Costa Mesa, CA, USA A Halloween-inspired hackathon hosted by the Iota Xi Honor Society at Orange Coast College. $1,000 in prizes Oct 24 – 26, 2025 91 participants
