I agree with Squirrels. I did not have a strong view but it made sense to drive to Warwick plus we did a few campus tours during the summer half term, and I went with him to the Cambridge Open Day. .
Choosing a University is a big decision, and then there are lots of variables, like getting the grades and how good is the competition. So its not just about choosing course and University, but also about considering approach (tactics?) and having a Plan B.
It is also useful to bring a different perspective. Our central London DS went on his own to LSE, indeed he was already attending public lectures, so had no problem seeing himself there. Part of my role as parent should be to raise aspiration and this perhaps involves suggesting he consider places outside his comfort zone and not necessarily settle for the nearest and most familiar. Though he could not see himself at a campus University, I think, once there, he would have enjoyed it. If this had been his only offer I could have reminded him of the plus points. Others might find the same in reverse as they look at London.
Something similar happened at Cambridge. Though he had not bought into the idea of Oxbridge per se, and we were agnostic, he absolutely loved Cambridge on the Open Day. I'm glad I saw this as it helped understand his disappointment when he was not offered a place.
He ended up with a very poor result in one AS paper, which made his four aspirational choices even more aspirational. I am pleased we were able to support him in deciding to apply to the same Universities, with the fallback of a resit, and a reapplication if needed. Being with him and seeing what he was interested in (he was overwhelmingly interested in the course, not the sports facilities or the student bar, but others will be different) helped a lot in what can be a difficult year.
I would recommend splitting up, and perhaps going to some of the peripheral talks whilst DC go to the main ones. This gives you a chance to swap impressions, and gives DC a chance to speak to people on their own. It is also worth listening to what they say about Personal Statements, so you can ensure that any summer holiday nagging about getting them done is constructive and informed.
I also found it really interesting. I realised I had never visited a campus University before. Oddly places that DS did not like would probably suit DD, so I have some ideas of where I might encourage her to visit (who again seems happy to restrict interest to places she can reach by bus.)
I have found myself looking out for animal print scarves. None spotted so far. Perhaps I will go up to UCL and lurk.