Join Chromosome 18 families from around the World that come together on Sunday November 15th, 2026 on Zoom for World Chromosome 18 Day! This FREE, virtual event is a chance to come together with our global chromosome 18 families to learn, connect, and have fun! Pre-Registration is required before you can join other families. More information about the schedule can be found on the World C18 Day section of our events tab. This will be the 4th Annual World C18 Day and we're so excited to invite everyone to join this special live educational and connection event. Date: Sunday November 15th, 2026 Time: Begins at 11:00am CT REGISTERATION WILL OPEN LATER THIS YEAR!