Churches are sanctuaries, and in Europe many if not most churches are always open. However, Sunday is the designated day for attendance and worship. There is no substitute for Sunday.
wasn’t really looking at it as a substitute. i’d like for instance to be able to come to church and find it open on my name day. in russia it’d either be open or there’d be someone on hand to open it for me (they opened the church at a convent for us on a thursday in my wife’s home town).
when you’ve only got 2 weeks abroad it limits the number of sundays...