You would be surprised how good the night life is at Lancaster. As other people have said, we have 9 colleges, all with their own bars, each college has student execs who arrange events and socials all year long. There are a massive amount of societies available across campus who all do their own things as well, so there is always something going on somewhere. And its commonly forgotten that Lancaster has two universities, so there are a large choice of bars and clubs in the city centre with student nights every night off the week.
Compared to the other unis I have visited friends at, even the ones in city centres, we have a hell of a lot available to us.