To celebrate Earth Hour The Choeur des enfants de Montréal, the Montreal Children's Choir, is offering a free concert at Christ Church Cathedral, located near McGill metro station.

The concert starts at 8:15 p.m. The lights will slowly be brought down until the official launch time of Earth Hour.

The global lights-off event takes place from 8:30 p.m. to 9:30 p.m. During this time the choir will sing by candlelight.

Christ Church Cathedral is at 635 Ste-Catherine Street West. Entry is free or by donation.