Logistics of baby, Fireworks, late night.....?

Okay I need some help here. Please. Our city puts on a huge fireworks thing called Red, White and Boom every year. It has been a tradition to go every year. The thing is that more than 500,000 converge on the city for this thing and it gets crazy. Last year Bradley was a month old so we didn't even consider going, we put him in his car seat drove around the outerbelt watched the fireworks and got home before traffic let out. This year my in-laws want to go with us, meet, and be with Bradley when he sees his first fireworks. We have a huge Metro Park about a 10 minute walk from our house so we can watch a safe distance from the madness of downtown but Bradley usually goes to bed at 7:30 and we'll be heading to the park at that time to wait for fireworks to start at 10pm. How does this work? Do babies usually get a second wind when exciting things happen like this? I am new at this and a little apprehensive about it. He is very easy going but we all have our limits!