Philadelphia weekender: Third Thursday, Pirate Day, treasure hunt

3️⃣ It's Third Thursday at the Navy Yard. Stop by from 4-7pm at the new 35,000-square-foot outdoor space for food trucks, live music and artists.

• This week’s lineup: Tex-Mex fare from El Tlaloc, cheesy melts from Moocheeze and pound cake from Poundcake Heaven.

🔍 It's National Treasure weekend. Carpenters' Hall is hosting Heist Night on Thursday and Saturday.

• Put on your best thinking caps while teaming up with friends and family to crack clues and solve riddles. TIckets: $50

😋 Don't get too cray at Friday's Crayfish Party at the American Swedish Historical Museum. Channel your inner Nordic and chow down on red crustaceans, Swedish meatballs, beet salad and more. Tickets: $70 for adults, $60 for members, $30 children 4-12.

🧑‍🎤 Canadian rock band Rush is playing two shows at Xfinity Mobile Arena, starting on Friday.

• If you miss that show, don't worry — there's another show Sunday at 7:30pm. Tickets: $176+

📚 Bookworms, make sure you bookmark Saturday's Philadelphia Bookstore Crawl.

• Running from Fishtown to Phoenixville, dozens of bookstores are participating. Expect special events, giveaways, discounts and book signings.

🏴‍☠️ Yo ho, yo ho, don't forget to take the kiddos to Pirate Day at Fort Mifflin.

• A treasure hunt, singalongs, weapons demos, and more. Make sure to dress up. Saturday, 10am-4pm.

1️⃣ This week’s Firstival celebrates what may be the world’s first selfie, snapped by Philadelphia’s Robert Cornelius in 1839.

• Head to Franklin Square on Saturday from 11am-1pm to see a colorful new #1 Sculpture inspired by the milestone and designed by local artist Alana Bograd.