For a holiday with very revolutionary roots, the Fourth of July has become decidedly apolitical, generally synonymous with BBQ, fireworks, and parades. But if you’re interested in putting the politics back into the celebration, head to the festivities at the Berkeley Marina (201 University Ave.) where Ben & Jerry’s co-founder Ben Cohen will be showcasing his “Amend-O-Matic StampMobile,” an art car that stamps messages like ‘Not to Be Used for Bribing Politicians,’ on dollar bills, and that he is taking on a national tour in support of his political campaign to “stamp” the money out of politics. In addition to the political activism on display, the festivities at the Marina will include food trucks, crafts, and musical entertainment by Bang Data, The Boston Boys, the Lady Crooners, The Blondies, and the Allman Stepbrothers. For kids, there will be juggling and magic acts, an inflatable bouncy area, and giant slides. And of course, the night will be capped off with an incredible display of fireworks off of the pier.