Based on the last few years(ourfirst college tours were Sept 2018), schools post September and October schedules in August, rarely before.
My ‘23 has a similar intense fine arts commitment every Saturday and even some sundays. Summer tours (after 10th and now finishing the last batch after 11th) really helped, plus some mid-week tours after AP classes were over in late spring of junior year. Don’t forget virtual programming has ways to interact with students and get more specific details on the schools.
Last summer we did 11 and even with some as self-guided outdoors-only, we still got a lot of information out of them and were able to expand or narrow the list accordingly.