The temple of whom (singularly possessive)?

Craig Brown has to mind his Ps and Qs when he goes carol-singing with The Pedants’ Association

It’s always pleasant to go carol-singing, or carols-singing, with The Pedants’ Association, formerly The Pedants Association, originally The Pedant’s Association. I first joined ten years ago with the long-term aim of attracting the requisite number of votes in order to change its title to The Association of Pedants, thus rendering the apostrophe redundant, but Rome wasn’t built in a day.