Big sky policy
Sure it is going to be busy - sure Kemble is in close prox to other 'dromes, AIAA, etc - BUT as PIC you are responsible - having said that, it will be less busy than J6 of the M6 or J15 of the M1 and they are 2d.
I will fly to the rally from Cornwall, will drop into Gloucs (Staverton) for motion lotion and will be tracking my progress at 120kts on a half mill map - eyeballs out of the cockpit, thumb slowly inching up the map.
do plan your route carefuly( that is your responsibility notwithstanding the AIC) , do keep a very good look out, do arrive and join at Kemble in accordance with the AIC
do go and do have fun!
Stik