Demi Lovato, Pixel Party and Lamb of God: Boston-area things to do this week, 4/20-4/26

Tuesday, 4/21

Arrow St. Arts presents a live immersive performance of scores by George Martin, who is often called "the fifth Beatle," 7pm.

• The show features iconic Beatles songs such as "Yesterday," Eleanor Rigby" and "Strawberry Fields Forever."

Wednesday, 4/22

Demi Lovato's "It's Not That Deep" tour stops at TD Garden, 8pm.

• Tickets: $99+.

Thursday, 4/23

Award-winning journalist Roxanne Khamsi discusses her new book, "Beyond Inheritance: Our Ever-Mutating Cells and a New Understanding of Health," at the Harvard Science Center, 6pm.

• RSVPs required: Free or $31.88 with a copy of the book.

Friday, 4/24

The Hustle List hosts "The Rent Party" at The Mix in Dorchester, a fundraising party to support Boston-area small businesses, 9pm-1am.

• Tickets: $27+.

Long Live Roxbury hosts its "Pixel Party," where you can build a wooden model of your favorite video game character while sipping some brews, 7-9pm.

• Tickets: $45 (includes a drink and supplies).

Saturday, 4/25

All She Wrote Books in Somerville celebrates Independent Bookstore Day with a book sale, 11am-7pm.

• Porter Square Books and other local bookstores are also holding events.

Sunday, 4/26

Metal band Lamb of God plays MGM Fenway,7pm.

• Tickets: $53+.