I'm sure it can be a bit confusing to someone new here like yourself, but well worth following.
The links above will give you the details, but breifly, St. Judes auction is in early June each year, and TG members put items up for bids. Lots of cool stuff, some archery related, others not, but all great items. Bids are submitted online until a specificed deadline, and the highest bidder wins the item. All proceeds go to St. Judes.
Curtis's link about the Sweat Origins explains where it started, and it has ended up as one of the best trips a person could take, bar none. Doesn't matter what is being hunted where, it is a chance to meet and hunt with a wide variety of people from all over that could never occur any other way.
Definately well worth taking the time to read about both of them. They are perfect examples of what this site is all about, although there are plenty of other opportunities to get involved as well.