Take the relatives to the show – simple.
Glad to find this thread as I was wondering where the show was. The fancy font used on the homepage is frankly unreadable. Please think about this when making posters. As I write one of the adverts flashing to my right is clearly readable in plain sans-serif font on an unobtrusive background while the one above is half as clear as it uses a fancy mixed colour font.
While I'm about it please give a thought to the signs for the last mile to your show. People can find the town ok with a map but big clear signs at junctions really help.
My club invested in big yellow professional signs. Expensive but after the first year we just pay for the new date sticker. (peel the date off straight after the show so it doesn't mark). We found the person in the council to apply to (free) each year giving clear details of the dozen signs position so we can legally put them on existing street poles a week before the show. The council are cooperative because we are using the pukka quality kit not crappy bits of cardboard. ******This 'advertising' significantly improves attendence becaue of its prominence and official look so has easily paid back the investment .*******