BOSTON (WHDH) -- There's a chance of rain, but that isn't stopping people from being ready for a blast Wednesday.

A thirty percent chance of rain and thunderstorms could dampen Fourth of July festivities in Boston, but preparations are still underway for a display that organizers say will be a sight to remember.

“The end of show is, I think, going to be a bit of a surprise,” pyrotechnic designer Eric Tucker said. “The finale song is different than anything we’ve ever done, and pyrotechnically how we’re dealing with that creatively is a little bit different. I think everyone is going to like it.”

Wednesday's concert will be a star-studded show.

Jennifer Hudson is the main act. She will perform some of her biggest hits.

Emmy-award winning actor and Andover native Michael Chiklis will host the night's festivities.