Mater Misericordiae Mission Phoenix issued the following announcement on Sept. 18.

Singers of all ages and all musical and religious backgrounds are welcome! This event is not a performance, there is no audience, and everyone is expected to participate in the singing. Enter through the east side gate and the double doors under the church sign (doors will be unlocked by 3:15). Extra books are available to borrow and can also be purchased for $30 (check or exact change is appreciated). If you're new, please familiarize yourself with the Fundamentals of Gregorian Chant: https://www.dropbox.com/.../Fundamentals%20of%20Gregorian. 

Sunday, October 11, 2020 at 3:30 PM – 5 PM

Original source can be found here.

Source: Mater Misericordiae Mission Phoenix