There are a couple of different levels of potential visits. I would look carefully at the admissions pages for the schools you hope to visit and see what’s still available, and maybe reach out the your student’s admissions officers to get their suggestions (the schools are also worried about this problem). Even if Admitted Students days are cancelled, many schools are still doing normal tours and visits. And even when those become unavailable, in most cases you can still walk around the town and campus to get a feel for the school and the students. Every year there is a debate on CC about Admitted Students days and whether they are actually better than ordinary visits. We went to one and it was fine, but I think overall we preferred the ordinary visits where the schools were more their normal selves. I agree that visits are important if you can possibly do them. Our S19 visited his school for the first time after he was accepted, just about this time last year I guess, and the visit was what decided things for him. (Just a regular visit, not Admitted Students day.)