You could do it as a cookie swap and have everyone who's coming bring X amount of cookies to swap out and then show them how to use the press. Try it at home first though, it's not as finicky as the last one but if you've never used it before, it can be a little difficult. Do a search in the files for spritz cookies and try one of the recipes. I know there is a simple one that is something like 1 cup flour, 1 cup peanut butter and 1 egg (check first, this is off the top of my head!). That would be a quick and simple one to show without making an entire batch of spritz cookies (which can be 7-10 dozen cookies!).