Startup School 2016 applications are open
blog.ycombinator.com
blog.ycombinator.com
There is some networking but that has a pretty dubious cost\benefit. You can treat it as a day off that might help you view your startup from the outside. If you are in a very isolated place then a bit of startup buzz might be nice. However, if you've got shit to do, I wouldn't bother and just watch the talks on youtube at your own pace in your downtime.
As for networking, like most of these things your mileage will vary depending on your base networking-quotient * luck (who you happen to talk to).
There are definitely worse ways to invest a Saturday.
The talks were "inspiring/motivational rather than practical/tactical", and I agree that you can get 95% of the value from the video streams. I think that being in the presence of "luminaries" will bring you back down to earth realizing that they're just ordinary folks at the end of the day.
You never know what can happen. Startups school is what you make of it.
Alternatively, you can get webhosting on subdomains for free on sites like tumblr, so at worst you could do that (but the former doesn't seem that much harder but seems a lot more professional.)
Another option would be to each put the same string in those fields; the grouping (assuming there is one; I haven't looked into it in depth) probably would be based on string matching rather an actual website existing.
Great speaker lineup too.
Cheers!