Hangin' in the Hamptons: Fireworks, pop-up parties and hip-hop

Pop-up parties, hip-hop show-ups and lights in the sky.

FIREWORKS ON THE FOURTH

You'll find them in Montauk at 9 tonight. (All town beaches are considered good viewing spots.) Otherwise, the place to be is Southampton Fresh Air Home's annual picnic benefit gala, which caps with a dazzling fireworks display over Shinnecock Bay ($300, sfah.org).

POP-UP PARTY

Nightlife impresario Travis Bass has a history of launching pop-up clubs in Manhattan -- see what he's up to now at The Bathing Club at Capri in Southampton, where he's hosting a 2-7 p.m. party Saturday. No cover charge, but reservations are a must. Email:

eventsusa@quintessentially.com

CELEBRITY EMCEE

Grammy-nominated emcee 2 Chainz is currently on tour, but he'll be stopping between shows in the U.K. and Seattle to host and perform at 1 OAK in Southampton Saturday. Your best chance of making the scene is with table reservations (631-204-5433, reservations@1oakhamptons. com). DJ Jus Ske to spin.

OTHER DOINGS

Director Rob Reiner has created some classic films ("When Harry Met Sally," "The Princess Bride"), and he'll be at Guild Hall in East Hampton Sunday to host a private showing of his latest work, "And So It Goes," starring Michael Douglas and Diane Keaton, both of whom are expected to be in attendance.

Like sandwiches? Follow the results of "Sandwar," taking place Saturday at Red Stixs in Water Mill. The culinary combatants are chef-host Jeff Mauro of Food Network's "Sandwich King" and 300 Sandwiches food blog writer Stephanie Smith, who will be vying to create clever concoctions. Track the progression on Instagram (@jeffmauro, @300sandwiches).