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Does anyone know if you can show up to pitch an idea, but not stay for the entire hackathon?
I have previous obligations for that weeken. Otherwise, I would stay for the whole thing.
I believe you only have to be onsite to check in at least once during the week (there is a cutoff for team checkin), then for the judging portion. That's at least how it was last year.

Correction. Please make sure you review "How does the Git Commit Challenge work?" and "Q: How does judging work?' questions in the FAQ.