Drombeg gets very crowded for the solstice so it could be a good idea to get there a day or two beforehand. The difference in sun position is minimal. A couple of minutes of a degree, or something like that.
If you want to have a ritual meeting atmosphere Clodagh may not be the place to go! It's a lovely site though.
Even though the last few days have been dry you should probably be prepared for wet-sponge like ground conditions. Especially if there is a shower or two. It has just rained so much over the last month.
Enjoy yourself, whatever way. Best of luck!