Karaoke Night: YouTube/Spotify + USB mics or SingStar/Let's Sing.
Potluck Feast: Assign courses/cuisines; diverse spread, low cost.
DIY Spa: Face masks, mani/pedi stations, cucumber water, robes.
Movie Marathon: Trilogy/LOTR/MCU/HP; themed snacks per film.
Game Night (Video + Tabletop): Jackbox, Mario Kart, Smash, plus classics.
Backyard Campout: Tents, fire pit/s'mores, stargazing app, ghost stories.
Planning Tips: Confirm guest count, budget, dietary needs, and vibe (chill vs. hype). Send digital invites 3-4 weeks out. Have a backup plan for weather (if outdoor). Most importantly: make the birthday teen feel celebrated!