I have never heard of a college that couldn’t piece together something meaningful for an accepted student even on short notice- which will be much more valuable than the dog and pony tours targeted to HS juniors. Your son will have specific questions about departments he’s interested in, activities he wants to continue, and not just “over here is the engineering building” type of tours.
And what athletic commitments are more important than him making a college decision? There’s no point in visiting a school if it’s at the bottom of his list and you have better (or more affordable ) options. But if it were my kid, short of needing surgery, he or she would be attending the accepted student event for the top 1 or 2 schools “just in case”.
If you can’t afford to visit- then don’t. But if it’s a question of missing a sports event… yikes.