To my knowledge I have never seen a club formally advertise groundsharing. Clearly it must go on at some level of course to alert neighbouring clubs who might clearly need a groundshare. Walton Casuals are an example having no ground of their own currently . But an interesting concept and why not.
Whyteleafe are a club in the environs of Croydon , sort of, who play in Ryman South and have a decent ground . This is their advert they put out today. Thoughts?