You are correct, Sealed Deck would be starters, and Sealed Booster would be booster packs. Pastimes in Chicago has listed their tournament as four booster packs. That will be great fun, just open 40 cards then shuffle and play. It does work perfectly in this game.
The other Sneak Peek tournaments are in Seattle, Redmond, Madison, and Burnsville, I will post more details on the blog as I get them. The stores are Legion, Uncles, Misty Mountain, and Card Kingdom.