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


You'll find them in Montauk at 9 Friday night. (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).


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


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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 tomorrow. Your best chance of making the scene is with table reservations (631-204-5433, reservations@1oakhamptons.com). DJ Jus Ske to spin.


* 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).