A day to celebrate pie? You don't have to ask us twice. OK, technically it's a day celebrating the mathematical constant pi (3.14159265359…), but give anyone an excuse to eat pie and they can overlook the whole math aspect. Here are some deals and activities for Saturday, March 14.

The Franklin Institute (222 N. 20th St.) offers the perfect balance of math and treats during their daylong programming. Opening four minutes early at 9:26 a.m., families can measure pi, memorize and recite pi's digits, launch actual pies and eat them, too.

Brunch spot Day by Day (2101 Sansom St.) is upping the ante by offering a collection of pies including pistachio frangipane with blood orange, vegan pear black tea, grapefruit chess, take five, seaweed sesame, spicy chocolate peanut butter, gluten free ricotta pomegranate, curried pineapple and pork, vegan pulled pork and more. They're open from 9:30 a.m. to 2:30 p.m. on Saturday.

Make your own pie at the Free Library of Philadelphia's Central Branch (1901 Vine St.) with Susan Quinn, baker at Greensgrow Farms. Using local ingredients, families can prepare the freshest fruit pies starting at 9:30 a.m.

Math learning center Mathnasium (8500 Henry Ave., Suite 44) will break down what pi actually is through games (with prizes) from 10 a.m. to 2 p.m.

Artisan pie boutique Magpie (1622 South St.) is offering slices of their butterscotch bourbon pies for a discounted $3.14 while supplies last. Get an early start: they open at 11 a.m.

As a part of the Craft Beer Express, Jose Pistola's (263 S. 15th St.) dares the hungry to take part in a Tastykake pie-eating contest and the educated to compete to see who can recite pi to the furthest decimal place. And in case you were wondering, here are some available drafts: Freecon Cidery Hoppy Mon, The Other Farm Brewery Saisonner, St. Bernardus Prior 8, Bells Two-Hearted, Bells Oarsman, Bells Hopslam, Oskar Blues Pinner, and Kazmatten Gratten Sante. They open at 11 a.m.

Pie Month continues at Growlers (736 S. 8th St.) with specialty pies will be available starting at 5 p.m. 

For more Things to Do, check out our calendar for the most up-to-date happenings.