Sacred Sites:
A good starting point for location of sacred sites can be found in the worldwide listings contained in
www.sacredsites.com
In Britain one of the most powerful sites is stonehenge, where ley lines converge. The "great ley" runs from St Michael's Mount in Cornwall through stone circles on Bodmin Moor and Dartmoor, the "Mump" at Burrowbridge, Glastonbury Tor and the Avebury Circle and all the way to Lowestoft in East Anglia. The medieval abbeys of Glastonbury and Bury St Edmunds and many old churches.
Someone will need to coordinate meeting points, times etc.