I hate to be negative but I have to share my opinion of this place. It was the single worst experience I have ever had on any vacation in my life.
First, we pre-purchased tickets for the first brunch as we were driving home on Sunday. A week before our trip, House of Blues called and said the first brunch was cancelled but we could have the second one.
We decided to do it and drive home very late (9 hour drive).
We got there and everyone was gathered upstairs waiting. There was complementary coffee and a bar. Nice enough so far!
Then they started taking parties in. 3 total employees walked each group down 1 by 1. It took forever to get seated.
When we were seated -we could not believe it.
There are a number of long, narrow, tables crammed (I mean crammed) into this tiny room with a stage. We were sat at a table with 10 other people and we were forced to sit apart from each other (which was utterly bizarre for a party of 2).
Everybody was on top of everybody else. It was so crammed I had to shimmy my arm in unnatural positions just to get my fork to my mouth. The chairs were literally back to back so it was constant bumping from behind for anyone trying to get out of their seat.
I have never been so uncomfortable in my life. Ever.
Two of the three employees were getting drinks for people but they never came back to give refills.
We just left after one plate. Never saw the performers. It was just too uncomfortable and awkward.
I will say the food was excellent. I understand the entertainment is good, but we will never know because by the time we left (1 hour into the brunch) the curtains hadn't opened yet.
If you are a huge fan of sardines, or are in a large party that can dominate a table it may be fun. However, I simply cannot recommend the place.
ETA: Sorry - I never answered your question. Advance tickets are probably a good idea for the sole fact that if they do this "cancel and combine" thing a lot, there's a very good chance it could be "sold out" when you get there.