We did Weymouth Regatta in the 12 a couple of years back - great event. Parking was tight at Castle Cove but most people found a spot on the last 200m of the approach road to the club. The dinghy park is also very tightly stacked, i.e. there is very little room for rolling boats onto their side for rigging. However, there is a gate in the left hand corner of the boat park (as you look at the water) which leads down to a small beach which is ideal for rigging and launching. Just watch out for the submerged outcrop of rocks on your left as you leave the beach - Havoc ripped her foils off on them on the way back in! We stayed at the Trelawney B+B which is walking distance to the club. Campsites were all a car ride away.