We've got you covered. Print your own STACK UP! stickers right from your printer.
Print the sticker sheet on Avery 22807 (2" round, 12 per sheet) labels at Actual size / 100%, not "Fit to page". Print the alignment test on plain paper first and hold it against a blank sticker sheet to check that the circles line up.
Sticker Sheet (PDF) Alignment Test (PDF)
An 8.5" x 11" poster to promote your event. Print it on plain letter paper and write your name or school in the "Contact" box so people know who to ask.