A few of points-
Challonge doesn't require people to register. It's (more or less) an online Tio. I don't like it as much as Tio, but it's an option that's very popular and easy. Tio is great, but it seems to have problems with large brackets (memory overflow error or something? same thing happened to us at ARK IV).
I'd recommend doing pools for bigger tournaments. If you run one tournament, it doesn't make a huge difference, but if you run 5... you can have a person in 5 DIFFERENT pools so they know exactly where to be from 2-3 PM, 3-4 PM, 4-5 PM, etc.
Some advice to get through brackets as fast as possible- skip players that aren't available so you can always just get matches going. A station "waiting" for a player to finish a match is wasting time. Also, get through Loser's Bracket as fast as possible so you can free those players up for the other tournies they are involved in.
Anyway, let me know if you ever need help from Arkansas for anything. You know we always got you guys covered.