There's quite a few pubs that are good in that area; the one closest to the con usually is pretty busy (that's on lombard), the one i went to and thought was really nice was up near treemont plaza (don't remember the name of the street tho).
for a better idea of where those two are; a
map of the area. the one closer to the con is near the 16 and 14 (food symbols) on that, and the other is near the 8 (hotel). and a safe back-up, even tho it may be loud, is the espn #7, which i also think is a hard rock.
and also that fountain is in the Pratt lobby, which would be in the right part of the center closest to the street. its also the entrance that we are usually forced to go into when they first open the building.