We've got our 'popular' days - Tues & Thursdays - tends to be the most social, we have sports sessions on at lunch times (badminton & football, we provide brekkie on thursday mornings along with our company update & Thursday tends to be the most likely night people will stick around for a drink in the evening.
So far it's mainly been food and socials lol so same, would love to hear if anyone's having success with other ideas?