New Hackathon Models
Hackathons have become decadent even before COVID-19 shut them down.
The abstract model of "bring talent together for a paid-for summit" is certainly an interesting one, though. "Unconferences" seems like the wrong term for this, especially since they're often not free to attend. "Retreats" come closer but don't imply any building will happen.
Corporate sponsors might be willing to experiment with new kinds of events. What about weekend/weeklong retreats? Probably have to get lucky with booking, or find a mechanism to co-host it with a group house.
Some models
Katherine Ye's Antidisciplinarathon
Asilomar conference grounds are great, I went to them in Monterey after learning about this: https://en.wikipedia.org/wiki/Asilomar_Conference_on_Recombinant_DNA
https://en.m.wikipedia.org/wiki/Mapathon
https://www.physics.mcgill.ca/hackathon/
HackUIUC was focused on open source contributions
https://twitter.com/maxkriegers/status/1512489227191144452
https://www.rabbitholeathon.com/
Related writing
https://jzhao.xyz/posts/hackathons/
https://jonathanxu.com/blog/2020-07-25-on-hackathons
https://twitter.com/0xmaddie_/status/1516252794751266816?s=21&t=6TYmdeZirWcLcbp8G5t99A