I used to design and make handmade wedding stationery and always did 2-3 fayres a year.
Generally, the more you spend on a table, the more the venue will be spending on publicity. I never did one where the table was under £150 but one good booking from a bride will easily cover that.
If I were you, be confident about asking people to book there and then. A lot of them are just out for a browse but if they seem keen, offer them a discount for booking there and then. Otherwise you may never hear from them again. Have lots of cards or flyers ready to give out too. You can also get keyrings printed with your logo/number which people are more likely to hang on to.
I've seen a few beauticians with fab printed posters of their previous bridal make up put up on easels at the back. They also have pictures of their work set out in nice albums. I know it maybe cost a bit to get these things initially but if you are doing a few fayres it is worthwhile.
Good luck. I used to love doing the fayres. Chatting to the brides and getting to know what they want is a great way to attract potential new customers.