Looking for Harley Davidson party supplies!!??!!?

My fiance is graduating soon from MMI where he is getting a degree to work on Harley’s. I would like to give him a graduation party, and invite all his Harley buds to come riding in on their Harley’ s. Problem: I can’t find any Harley party supplies like plates, cups, banners, etc. Any help would be appreciated. Also I was thinking of grilling some hot dogs for food instead of the usual finger sandwiches you have at parties as well as coolers of soft drinks instead of punch. What do you think of that? Thanks for any info!