its a fair question to ask when at Open Days, especially of the students showing you round. Pretty much every Uni does something, but there will be plenty of variation
Before you arrive at Uni you are likely to get invited to a few online chat channels (like WhatsApp etc), many initiated by the Uni/SU. These can help you find folks in your accommodation or on your course.
My daughter started at Lancaster this year. The Uni/SU organised lots of events for all Freshers, only a handful were clubbing, there were day trips, social events and all manner of different things. The individual halls of residence (Lancaster call them colleges) had lots of (smaller) events too.
Lancaster seems to puts lots of Freshers together in accommodation, and courses run intro lectures in Freshers week - so there are also chances to make friends there. One nice touch, the Uni also provided a meal pack to every Freshers flat, so folks could cook and eat a meal together, which was fun apparently.
There was also a massive Freshers Fair where 200+ clubs and societies. These clubs organise Freshers events etc too, like sports club try outs - most Unis publish lists of all the clubs, so you can plan ahead a pick the ones you are interested in