The choruses of the Associated Male Choruses of America join forces in a festival of singing called a "Big Sing" each year! A host chorus (with guidance from a District or International Committee) plans the Big Sing. Chorus come together for comraderie, support, and learning. Clinicians are invited to listen to and work with choruses. Choruses listen to each other; new music materials are presented and sung in reading sessions; various workshops are presented to assist choruses in the own performances; choruses present their own solo selections. Finally, the choruses rehearse together and join in a festival concert with ALL the choruses singing together.

There usually is "social" time incorporated in the day for singers and their "supporters" and a final "social" (usually called an "afterglow") may cap the Big Sing activities after all the formal events have taken place. Choruses will usually sing their "lighter" selections for each other and many of these social/singing gatherings continue far into the night.

Each AMCA District assigns a host chorus to plan and host a big sing for that district each year.

Every 5 years, there has been an International "Big Sing" for all member choruses

In years when there is an "International Big Sing", AMCA Districts usually focus on the International event rather than hold "District Big Sings".