Five ways to have fun this weekend.

1. The big movie opening in theaters this weekend is “The LEGO Ninjago Movie!” a PG-rated animated film about six ninjas that are also ordinary teens struggling against their greatest enemy: high school; the R-rated action-adventure “Kingsman: The Golden Circle” about a gentleman’s secret spy society; and the PG-13 biopic “Battle of the Sexes,” the true story of the 1973 tennis match between World number one Billie Jean King (Emma Stone) and ex-champ and serial hustler Bobby Riggs (Steve Carell).

2. September is National Piano Month, a holiday started in 1991 by the National Piano Foundation. The piano is widely employed in classical, jazz, traditional and popular music, so celebrate by signing up for lessons or making a playlist of your favorite piano songs such as Elton John’s “Tiny Dancer.”

3. Banned Books Week begins Sunday. Head to your local library for more information, or Google books that are commonly banned (“Harry Potter” and “The Adventures of Huckleberry Finn,” for example). For this year’s celebration, the coalition of organizations that sponsors Banned Books Week will emphasize the importance of the First Amendment, which guarantees our inherent right to read.

4. Saturday is Hobbit Day, a day that’s also part of Tolkien Week. Hobbit Day commemorates the birthdays of Bilbo and Frodo Baggins. Some libraries and bookstores will be holding events, or plan your own Hobbit birthday bash!

5. It’s another big sports weekend, so get out those TV listings and start planning your TV time. NASCAR’s championship playoffs continue with races at New Hampshire Motor Speedway. Other sports on TV this weekend include college football, NFL, MLB, soccer and more.