I agree. Maybe you should highlight the "special place and time" aspect, and also you could see if it's possibile to get a deal with some online printing servic

I agree. Maybe you should highlight the "special place and time" aspect, and also you could see if it's possibile to get a deal with some online printing service (i hope some have API) so people can directly order the printed chart. A preview, as said by other user, would be good (and also the free share-on-FB feature could be useful to spread the word of your site)