Well, the companion is a no-brainer: my sweetie!
And if it's dinner AND a concert, then that lets out some of the restaurants I'd love to go to, because you really need to give them the whole evening.
Soooooooooooo...I think dinner is probably at Earl's or someplace like that, unless there's somewhere nice that's close to the concert venue and accustomed to serving patrons before concerts.
The concert? Hmmm...A symphony concert, or one of the really excellent local choral groups... Now, if someone like Chanticleer or the Estonian Philharmonic Chamber Choir or Orphei Drangar were in town...