I live and grew up in Malden, just a few minutes to the north.
Your short time frame (and the possibility of a snowstorm Wednesday afternoon) don’t leave you with many choices, but:
–I really wish I knew more about our local museums, but I’m pretty sure that none are open late enough for you to go to them.
–Charlestown is just over the bridge from the North End, our Italian district. Cafe Pompeii is pretty good and open late, on Hanover Street. Bova’s Bakery (takeout only) is open 24 hours and has great cannoli. Maybe read some reviews on Yelp.com for other Italian restaurants.
–Newbury street is the fancy area, and Trident Booksellers sells a little bit of food (delicious sweet potato fries!) is open until midnight, and I’m pretty sure has free wi-fi.
–I don’t know Charlestown very well, sorry. Generally it only attracts tourists becuase of its historic sites, which you probably won’t get to see in your short stay. You might get to take a quick look at the Bunker Hill Monument from the outside.
–You’d be a short taxi ride from Cambridge’s Central Square, which has lots of bars with live music. The Middle East is probably the best-known place, with several others nearby.
–Somerville also isn’t very far away, and the Davis Square neighborhood has quite a few bars, as it’s not far from Tufts University.
–I’m more used to grabbing a Bud Light or whatever’s on hand at the party, so I don’t know much about good beer. But I’ve heard some good things about Boston Beer Works, near Fenway Park…they have lots of beer on tap (and no big-brand beers) as well as food. That might be of interest to you.
Good luck on your interview, and I hope you’ll someday have more time to get to know Boston better.