Hi Micah,
I've done a lot of work in Georgia on the default services side of the business for a couple of larger Atlanta area firms.
Legally, Georgia sales can take place at any time during business hours on the first Tuesday (or Wednesday if the Tuesday is a holiday) of each month, so be prepared to spend some time if you are attending the sale.
Generally speaking, the representative reading the Notice of Sale can represent any number of firms, so be sure you ask which firm (or firms) are being represented. The good ones will have a list of properties for you to look at on a board or a document.
PLEASE NOTE: Just because you see a published notice for a property, that does not necessarily mean it's going to be auctioned. In my experience, about 25% of the properties that publish in a month actually end up going to sale in that month. Many times the sales are cancelled, or postponed and restarted for the next month. I recommend calling the firm that is handling the property the day before the sale to be sure it will be auctioned the next day, or you could spend the entire day at the auction for nothing.
You likely know this already, but you will need a cashier's check to turn over to the representative if you win an auction. Most buyers have cashier's checks drafted to themselves in multiple increments, which they sign over to the firm should they win the auction. Any excess funds provided are refunded by the firm once the file is received and processed by them.
Thanks and let me know if you have any other questions!
Best of Luck,
Ryan