I'm throwing this to the group - on Saturday evening we have a couple of options for consideration:
Pre-dinner drinks, formal sit down dinner, then let rip in one of the many pubs/clubs in the city centre
or
Gather at a suitably sized drinking establishment that also caters for those who wish to eat. There are many pubs in the city that allow for a more fluid one-stop arrangement such as this. Of course, late drinking goes without saying
Please feel free to add any alternative suggestions you might have.