Lol geez, these toy fairs and mainly Star Wars events crop up all over the place There'll be one on Mars next hehe
Sadly unless you have the variety and volume of items required it would not be worth you doing it unless you knew you could at least make your £50.00 back with what you might already have.
Most of the stalls will be small independent toy shops trying to shift poor selling figures with maybe some sought after items they'll no doubt be asking lots of money for as well as collectors having stalls to shift items they may no longer want or have multiples of themselves with some sought after items they'll also ask a lot of money for. Just like I see sellers on eBay asking upwards of £30 for some figures that are rare now from more recent lines. I have cases of Darth Vader figures going back to the 30th Anniversary line though if anyone there is interested lol.
If you are going along to it anyway it might be worth mentioning to those wandering around about the availability of Star Wars items on eBid - you will reach far more people than eBid did last year with their tweet on Twitter about there being 5,000+ Star Wars items on eBid haha and I wish I was joking about that
The main reason I am doing paid for advertising on FB once per month now is because collectors are on there in their thousands and there's collecting groups/pages as well so by advertising on FB I can hopefully reach those collectors and tempt them from the dark side to the light side hehe