This weekend: Jennifer Lawrence hosts ‘SNL’; ‘Fringe’ ends; ‘Prosecuting Casey Anthony’ premieres

The weekend’s biggest prime-time program will be the AFC Championship. The Baltimore-New England game starts at 6:30 p.m. Sunday on CBS. (The NFC Championship, featuring San Francisco and Atlanta, begins at 3 p.m. Sunday on Fox, out from prime time.) CBS will be the beneficiary of huge ratings and will try to heighten interest in “Hawaii Five-O,” which offers a new episode after the game.

If you want drama instead of football on Sunday, ABC serves up fresh episodes of “Once Upon a Time” at 8 and “Revenge” (at 9 with guest star Dylan Walsh). And PBS has another installment of “Downton Abbey” at 9 on “Masterpiece.”

Elsewhere this weekend:

Lifetime has this little movie called “Prosecuting Casey Anthony.” Maybe you’ve heard of it. It premieres at 8 p.m. Saturday, and Rob Lowe plays Jeff Ashton.

CBS’ “48 Hours” has followed the Anthony case, but the newsmagazine turns to the Jodi Arias saga at 10 p.m. Saturday.

Jennifer Lawrence is an Oscar front-runner for “Silver Linings Playbook.” Could hosting “Saturday Night Live” win over Academy Award voters? You can find out at 11:30 p.m. Saturday on NBC. The musical guest is the Lumineers.

Fox brings down the curtain on “Fringe” with two hours at 8 p.m. Friday. The show has a small but devoted fan base, and Fox stuck with a series that usually would have been axed for low ratings. Congrats to everyone for making it to 100 episodes.