Your plebe will be in a duty status until the end of Blue and Gold being sung at game end, and will probably not have had town liberty or Yard liberty prior to the game. He/she is not supposed to be wandering around during the game. The staff officers/senior enlisted and midshipman duty group who monitor this can vary in their strictness. There are some other threads on here which address this. Post-game, there will be town liberty until a specified time, which has not yet been set forth for this year. These kinds of things get adjusted/reconfirmed when the Brigade reforms in August. It's been 2200 (10 PM) for plebes for town liberty on Saturdays, though if they show good spirit and Navy wins, could be midnight. Yard liberty will apply for Sunday, which means you can go see him/her, but he/she can't come out. Plebes will also be in a regular duty section on some weekends, which usually means no liberty.
Non-football, non-duty weekends are the best, I think. Though I think plebes are pretty happy to see any family who can help them escape the Yard even if for a short period and a quick post-game meal...
See new thread I'm going to start in a sec with the latest copy of MIDREGS I could find online. Home football games are covered by a separate instruction, but there's a key phrase: a. Midshipmen shall:
(1) Maintain Brigade seating integrity.