Tax Holiday Sale 2014 at Harvard Book Store from 9 a.m. to 11 p.m. Saturday and 10 a.m. to 10 p.m. on Sunday at Harvard Book Store, 1256 Massachusetts Ave., Harvard Square.

The state sales tax is suspended for the weekend, but Harvard Book Store has gone even further to encourage shopping by offering a 15 percent discount on top for new, used and remainder books, as well as on Print on Demand titles from its database and non-book items throughout the store such as clothing, cards, chocolate, canvas bags, mugs and so on. (No discount for gift cards, on Kobo e-readers or e-books and already-discounted items). Online customers get the discount also, with the coupon code taxholiday2014. Information is here.

Lilypad Yard Sale from 10 a.m. to 6 p.m. at Lilypad, 1353 Cambridge St., Inman Square.

This Inman Square performance space is adding a green room and recording studio, which means it needs to empty out its basement of the music gear, electronics, clothing and costumes that have accumulated there over the years. Information is here.

Boston Poetry Marathon World Cup 2014 from 12:30 to 11 p.m. Saturday and 1 to 5 p.m. Sunday at Outpost 186, 186.5 Hampshire St., Inman Square. Donations are requested.

The list of poets signed up to read at this event (which starts with a 7 to 10 p.m. Friday taste of the hours of creativity to come) goes on and on and on, but each poet gets only eight minutes on stage. Background on this 18-hour event from last year is here. The schedule is here.

https://www.youtube.com/watch?v=eZbzbC9285I

“The Incredibles” at 4 and 8 p.m. at the Massachusetts Institute of Technology’s Building 26-100, also known as the Compton Laboratories, at 60 Vassar St. Free.

This beloved 2004 animated film about a family of superheroes got a 90 score on Metacritic (and 8.7 out of 10 from audiences) and a, well, incredible 97 percent on Rotten Tomatoes (and for some reason a 74 percent from audiences). Information on the summer of free screenings from the MIT Lecture Series Committee is here.

Summer Fling festival of one-minute films at 7:30 p.m. Saturday at Gallery 263, 263 Pearl St., Cambridgeport. Admission is a $10 donation at the door, with sangria and flavored popcorn included.

The rules were to submit a one-minute film on the theme “summertime” in any genre – narrative, abstract, animated, musical or silent, whatever the filmmakers wished, and submissions were welcome from anyone, anywhere, by solo artist or by a group. Now the nonprofit Gallery 263 is revealing the results. Information is here.