Ms. Turman had knitted a black bolero that her daughter wore over her white sequined Badgley Mischka dress, a borrowed purchase from Rent the Runway. This was another testament to the couple’s flexibility: Ms. Wynn’s first choice, a strapless, floaty rental from Allison Parris, fell through at the last minute. Going with the flow felt a bit unnatural to Ms. Wynn, who is such a planner that, shortly after beginning to date Mr. Poms, she plugged his phone number into her younger brother’s phone. “David P. Future Brother-in-Law,” the listing read.

“This is just, for the record, not my personality,” Ms. Wynn said of the rushed affair.

During the short ceremony, the restaurant’s sound system, which had been blasting Fetty Wap, was silenced. The couple read their own vows: “I realize that my love is like Pi,” Mr. Poms said to his bride at one point, “because it goes on indefinitely.”

Marrying on Pi Day did not hold a particular significance to this couple, but earlier in the day, Rafael Hernandez, a 30-year-old law student, and Nyasha Hamilton, a 28-year-old database analyst for the District of Columbia Public Schools, pushed back their ceremony start so they could get married in front of their 20 guests at 3:14 p.m. on the dot. Ms. Hamilton is both a math major and an instructor for the local chapter of Women Who Code.

During the six-minute wedding, Ms. Hamilton thanked her husband for always supporting her crazy ideas, “like getting married at &pizza.”

The pair, who grew up in Atlanta, did not always know they would end up getting married — especially here, in a pizza place, among displays of black-and-white calla lilies, custom-made pizzas and sprinkle-speckled Momofuku cakes, all provided gratis. The road to this ceremony took compromise, with Mr. Hernandez putting in for a transfer at his job as a project manager at a fabrication business to join Ms. Hamilton in Louisiana, where she finished a master’s degree program in statistics at Louisiana State University.