One of the items on the "To Do List" is probably t-shirts for the attendees to wear so that members of your group are easily identified. Below is a selection of shirts that allow customization. The first shirt allows the basic Surname in the middle of the reflected trees. In the upper trees, you can personalize with the Names of Ancestor families, below, enter the names of the descendant families.
T-shirt - Genealogy tree/dark by GenFam
Browse additional t-shirts at zazzle.com
Click on the title below the image to link to the product page where you can edit the item and order. (If you do not see a "personalize it" section on the right, then click on the orange "Customize it" button to the lower left of the image.)