The Theta Lambda Chapter was colonized in October 2011 with 72 women and was installed on November 20, 2011. On that day the mayor of Lancaster declared it ADPi day! Sister Kaitlin Kines was elected the first president of Theta Lambda!
Theta Lambda hosted their first annul "Tug-of-Roar" event in the fall of 2012 and the event was a huge success! Many sports teams, fraternities, sororities and other groups on campus now come out every fall to play a fun game of tug-of-war and support Alpha Delta Pi and The Ronald McDonald House Charities.
A few years later, in the spring of 2014, Theta Lambda put together and hosted a widely successful Casino Night where other students and faculty came to play casino games and win prizes. The event is now called "The Mane Event" and will be hosted Homecoming weekend for alumni and families to enjoy and participate.