church parade
noun
1 Military (originally and chiefly British ) divine service attended as a unit, either in church or on a parade ground, etc. (compulsory in the British Army until 1946).
2The attendance of the members of a society, etc., as a group at a church service.
3An assembly of fashionable churchgoers after Sunday morning service, especially to walk in a public park (now historical ).
Origin
Late 18th century.