I'm pretty sure at the AGM in Zandvoort, it was agreed that GC events would only be held where a local national F16 committee had been formed (and acknowledged by the Governing F16 council) with a F16 class constitution.
Currently I believe there is a Dutch & USA F16 committee with F16 class constitution. With the UK & the AUS committee's forming imminent.
John Alani might be able to correct/deny/update.??