Drop in and schmooze your prospective college?

I noted this cheery invitation on the website of the California State University Northridge Jazz Studies Department:

Students should take a moment to contact us so that we may know who they are in advance. Students are invited to visit our classes, meet our majors and listen in on a master class and/or rehearsal — all are welcome.

The mom of a college applicant in musical theater tells me about a response like this from CSU Fullerton, a strong school in that discipline. She heard that prospective applicants were invited to visit, but when she called the university's main number, the response was along the lines of "oh, no, they're much too busy to have applicants hanging around." But she persisted enough to call the Arts Department itself, and got an enthusiastic invitation. The faculty set up visits for the applicant with dance, voice and theater classes, invited him to sit in on a rehearsal for the upcoming musical, and arranged for current students to take the applicant and his mom to dinner.

How likely is a prospective applicant to get an invitation like that from any given department anywhere? I haven't found out, so far. But it sounds worth trying.