Even though the candidates for President from the two major parties seems to be decided by now, there is still a Primary Election scheduled for tomorrow. Though Mitt Romney and Barack Obama have a virtual lock on their parties nominations, there are Delegates to the convention which need voting for tomorrow.
Due to expected low voter turn out, there will be fewer than normal polling places in the City of Providence. The city has a list of polling places [.pdf] (look for your Ward).
Update: Voters without ID will be allowed to fill out a provisional ballot, the signature on which will then be matched to their voter registration (sounds like a lot of work for elections officials).