Hi Colleen, The nearest show to you would be the Royal Highland Show which is held on 19, 20, 21, 22 June, see their website and contact them for details. They used to be on the NBCC's circuit, and had a gate makeing competition, live blacksmithing alongside the farriers, and a metalwork display/competition in the crafts tent. There are very many 'smiths in Scotland, so they should be able to support it and put on a good show for the public.
Another show that has a forging competition is the Great Yorkshire Show at Harrogate held on 8,9,10 June, Don Barker is the guy responsible for this section and would be able to tell you more, I know they have an excellent static competition, but I am not sure if they have a live competition as such.
I would think some of the smaller Highland Shows would also appreciate your presence, why not enquire?
Good luck with it and maybe our paths will cross one day.