Another thing to remember is that the further they are along in college the less they come hone. By junior yr. my kid stayed on campus during Oct. break & Feb break (his college had a different schedule than most) Also, a lot of parents stop going to Parents weekend.after freshman year.
Also, ditto what Marian said about hotel prices - especially if college is in a small city/town. The normal rate for hotel room we paid for random weekend was $100/night. Graduation weekend it was $385 and was pay in advance. We chose to stay 20 minutes away in another town and it was $125 cheaper per night and we didn’t have to pay in advance.