Hi There,
Agreed with Joe.
Limerick (Hey Gerry, if you are around...) sound like it's in the middle of everywhere. But Isle of Mann sound even better ! I'm in !
For the date, same, avoid the first week of July (Retroplane !!!

), but I think it must be run for a week end (2days)
For the event format.. Well, we can have a scale National, in a promotion format. That mean 2 categories, vintage / modern, and judged by the pilots.
For the other categories, you just need to be carefull not to transform the National to a big Fly-in. Can be nice too, but I think we need this year event as a category promotion, to have a better definition of the glider category in the MACI.
Just thinking of a national with combat.. More a fun fly category, and may not have his space in a National, and that may be confusing at the end about what this National is about.
I will go for Scale, Race and Aerobatics, and stick to these categories. But we can have a combat in a break !

Banzaiiii !!
All categories judges by pilots, in a friendly contest, but at least, that can be a good base for 2008 and a "real" National (meaning with Judges, paperwork and so on...

)
Hope I'm clear and that will help you a bit.
Fred