The 3-Gun matches at EAPS are normally held on the second Sunday of the month. Lately the weather has been a problem and a few had to be cancelled. I do know that for this month they are holding a just pistol match for both the second & third weekends so that some folks can get classified. You can go to their web page and send an email to make sure.
To get started in 3-Gun, you can look up the rules in USPSA or 3-Gun Nation to see what the rules are and what folks are using. Matches are held at EAPS, Poplaville Ms., in Biloxi Ms. & there is a new one starting at a range by the Stennis Space Center. There is plenty of 8nformation out there, you just have to look a little.
You can call me at Louisiana Gun @225-389-6077 if you need more information.