My EA OOS kid got email invites to the New Dawgs program at her personal email address on Jan 8 and Feb 22. The sign-up button in the email leads to the portal log in page, so maybe have your son poke around in his portal and look for New Dawg dates there.
We chose to organize our own visit, as my kid wanted to sit in on some classes, meet students in her intended major, tour a couple of LLCs, talk to the department about placement, etc. That worked out great.
We did do the regular tour. The admissions talk at the beginning is less relevant for accepted students, but at least it was more entertaining than the average admissions talk. And the student tour guides are great. They really try to personalize it for the kids, even giving them each time to chat one-on-one with the tour guide while walking between stops on the tour.
Edit to add: we’ve now visited twice. The first time, we stayed at Georgia Center, the on-campus hotel/convention center. When we signed up for a campus tour, they sent us a link for discount reservations at the campus hotel. (Also, the tour gets you a coupon for a decent discount on campus merch!) It was really nice staying right on campus. The second time we got an Airbnb just north of downtown, less than 10 minutes walk to the arch. That worked out really well too.