Entertainment Movies The 'Mean Girls' Cast — Including Lindsay Lohan — Reunites on 'Mean Girls' Day for a Special Cause Oct. 3, an important date in the beloved comedy movie, is known by fans as "Mean Girls Day" By Helen Murphy Published on October 3, 2019 11:17 AM Share Tweet Pin Email Happy Mean Girls Day! On Thursday, the cast of the beloved 2004 comedy reunited for a special cause in honor of Mean Girls Day. The holiday is celebrated on Oct. 3 every year — the same day that Mean Girls character Aaron Samuels asked Cady Heron what day it was in math class. Stars Lindsay Lohan, Jonathan Bennett, Amanda Seyfried and more joined together to create a special video message in support of the Thirst Project, encouraging fans to donate money to build a fresh water well in Uganda with the hashtag #MeanGirlsDoGood. Bennett — who played Aaron Samuels in the film — opens up the video by joking, “Today, of course I’ll ask you what day it is.” “This October third, we’re teaming up with the Thirst Project,” Seyfried, 33, explains. “Thirst Project builds fresh water wells in developing countries to bring clean water to those who need it most,” Lacey Chabert continues. “We all know Cady was from Africa,” Lohan, 33, chimes in, “but this year we want to help building a well in Uganda — and I want your help.” The cast then asked fans to donate three dollars to their Thirst Project campaign in honor of Oct. 3, to help reach their goal of $8,000. According to the campaign’s website, $8,000 covers the cost of building a well for an entire village in Uganda, which would bring clean water to almost 500 people. Lindsay Lohan Wishes Happy Mean Girls Day with Her Brother Days After Bizarre Controversy Paramount Also celebrating the Mean Girls holiday is the movie’s writer and star Tina Fey. On Thursday, the actress is hosting a screening of the movie during a Facebook Live event from New York City, in partnership with Facebook and Paramount Pictures. Tina Fey and Busy Philipps Are Hosting an Ultimate Mean GirlsWatch Party on October 3 The livestream will kick off at 8 p.m. ET. and Fey will be joined by friend and Mean Girls super-fan Busy Philipps for the screening, with both participating in fun activities before, during and after the movie. The special event comes 15 years after the movie hit theaters in April 2004. Also starring Rachel McAdams, Amy Poehler, Lizzy Caplan and Tim Meadows, the movie has gone on to garner a cult following and even spun off a musical adaptation currently running on Broadway. Fans can donate to the Mean Girls Thirst Project campaign here.