I was just there for the Zac Brown Band concert. It was AWESOME. Love the band and love the venue.
Doors opened at I think 4. We got there at 5, thinking there would be opening acts. Instead waited until the concert actually started at 7. But it wasn't bad. Parking is not an issue at all. The place is tiny compared to the Comcast Center, what I'm used to.
It is located directly across from Silver Sands/MVYC. Give them a call and see if you can arrange something. Definitely within walking distance. VIP parking is not worth it. I was out of a sold out concert in 5 minutes. It's not a Sox game, that's for sure.
A bit off topic, if you like country music and haven't heard ZBB, give them a listen. Great music and they have done some amazing stuff for military overseas. At the concert, he was giving away a new CD to those that wrote a letter to a soldier.
"Free" Official music video