From Tuck's Admission Blog
I'm sure other schools are similar.Link
The advice that I have to offer is very Tuck specific - please make an effort to interact with us while you are there. We are very happy to talk to you and to discuss whatever is on your mind; it reflects well for you to undertake a through examination of your options. You should know that our alums are very passionate about Tuck, and therefore happy to talk about their time here, and also that we do pay attention to our conversations with you. It is not at all uncommon for an alum to let us know when they have met a really dynamic candidate, and we officers are also keeping track of people who make really great impressions. I mention this in the spirit of admissions guidance; I am not sure that prospects realize just how important it is to capitalize on every opportunity to shine. While you should definitely ask candid questions and learn all that you can - and we do not in any way expect you to attend receptions with prior knowledge about Tuck - we do notice candidates who seem genuine, thoughtful, and interested in engaging with us. These are characteristics that are prevalent in our community, and it helps you to stand out if you can demonstrate them. We really enjoy hosting receptions, and hope that you also find them to be both helpful and pleasant. Finally, it is great to hear from prospects afterward. I welcome follow-up emails and calls, and look forward to seeing many of you here for campus visits.