If you've seen the signs around downtown that simply say Twelve162twenty.com, and wondered what in the world they were all about, the mystery has been revealed.

The website, which initially only rotated through cryptic messages, now details what is going on.

The text reads:

Need knows no hour. Join The Salvation Army at 2:20 a.m. on December 16 at Van Andel Arena. Take a stand in the shoes of the underserved in Grand Rapids. Ring a bell. Change a life.

Download the free bell ringer app for smart phones below and make your "voice" heard at 2:20 a.m. on December 16.

The 32-hour long bell ringing marathon will start at 6 a.m. on December 15th and end at approximately 2 p.m. on December 16th.

The bell ringing app is available for both iPhone and Android.