A really good one is the list of Games on the NASGA database. The only problem with the database is that it is user updated, so if no one puts the game in it doesn't show. Most games do seem to get entered though, and being a database there are various ways to search. You can look by month, by states, etc...
It's also geared towards the athletic events, so if a Gathering doesn't have athletics it might not be entered. It's a good resource, but probably shouldn't be your only one.
Odd, its missing most of the California games, including the ones the take place the same weekend every year. The list on the site Yaish supplied looks a lot more complete at least as far as California is concerned.
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