We will have Tashlich immediately following the Rosh Hashana Morning service.

"'Casting away;' A traditional ceremony held during the Yamim Nora-im (Days of Awe), usually on the first day of Rosh HaShanah, in which individuals symbolically 'cast away' their sins or wrongdoings from the past year by throwing breadcrumbs into a flowing body of water." (URJ)