In Denmark for years churches have had week-day evening services, night church, where you can drop in at any hour of the night, say a prayer, join in if a service is being held etc. Coffee after Sunday services and "Spagetti services" - a weekday evening service followed or preceded by a meal. These are particularly advertised as being both for families with smal. children and for those living alone.
None of these have significantly increased church attendence.
Both as a Christian and as a historian of religion, I am convinced that until the various denominations get themselves out of church /synagogue/mosque/etc and start a mission strategy, we will not see religion becoming important again.
No-one is terribly likely to attend any form of Divine service if they either do not know that we who do attend believe in God and what that actually entails, or feel particularly welcome if they do by chance drop into a church,
By and large, the congregation and clergy just ignore newcomers. A peculiar attitude, which ought to be condemmed by any right-thinking religious person of any faith.