Weddingbee boards

I'm getting married in the Boston area over Mem Day weekend although I haven't lived in Boston in years.  My future MIL would like to hold the RD at a restaurant in the North End.  We're thinking about inviting the OOTers, so we could be talking 75-100 people.  I'd like to to be quite affordable.  Any ideas?  Something good, not too expensive, with a large private space?

There are definitely restaurants in the North End with big private spaces - Lucca, Artu, and Bacco Ristorante are apparently some that have large private rooms.  My question is, which are any good, and which are affordable.  I'd love to have a rehearsal dinner at a Giacomo-type place, although I know Giacomo would never go for that!