Now that every party guest arrives with cell phone in hand, hosts are finding ways to take advantage of all those extra cameras. This year’s hot party accessory is the Snapchat Geofilter, which allows hosts to stamp a custom design on photos and videos taken at the precise time and place of their event. Rented photo booths are also capable of texting images directly to guests’ cell phones, encouraging them to post the photos on social media or even project them onto a video screen during the event. And once the party’s over, apps like Veri and Webpix allow everyone to share their photos in one place. “You have to look for ways to integrate the phones into the fun,” says local party planner Sandy Max. “For kids especially, this is the way they interact and enjoy things now.”