Hey Melanie, I love Debby’s stuff over at Retreat in a Bag! 🙂 I’ve done communion toward the end of the retreat, during the retreat, and this past year it was one of our prayer stations. I would not put it at the very, very end. Depending on the speaker, I would be tempted to make it a part of your last teaching session on Sunday morning, unless it fits better elsewhere. You could then move into a song, written reflection, surveys, reflection time out loud, and then a closing prayer. Hope that helps! Great question!