Choral Alumni Weekend – Hosted by WPI Men's Glee Club (the men's chorus) and Alden Voices (the women's chorus), this weekend is an annual gathering for alumni of these organizations. It begins on Thursday night, when the members and alumni of the chorus gather at O'Connor's restaurant. Friday night, Simple Harmonic Motion (WPI's oldest a cappella group) hosts A Cappella Festival (also known as AC Fest) in Alden Hall, with guest appearances from the other a cappella groups on campus.