Saturday morning update: A number of people have noticed intermittent awful slowness. I just did a load test on the prompts page and came up with an average load time of 1/4-1/2 second for about 10 tries... and then one that was 65 seconds. Then a bunch of short loads, then one that was 38 seconds and another with 62. So, I suspect something is still up with the server. I will put in another trouble ticket with my host. There's not a lot I can do, since it's not a fault with the script. It is unlikely to be merely an issue of too many people - we've had much livelier 'Fests with fewer problems.
Do not worry about making claims or tags if the site is misbehaving - I will have a 'limbo' period after Sketch Fest that will allow you to upload artwork after it has ended regardless of whether you claimed it or not (only artwork that was CREATED during Sketch Fest, please, per usual!).
Baby's waking up and I need some breakfast, but I will try to get back soon and fix other things that may be broken!