Unless you're clergy, the only things you really need to keep track of are Christmas and Easter in case you want to dress your best for the big holidays. And Ash Wednesday if you want to be sure to attend. Everything else kind of gets handled for you.
I've never needed to know what version of the liturgy we were going to be using before I sat down in a pew.
The real difference-maker, in my Lutheran experience, is how often your congregation does Holy Communion.
do people not do it every week?
Again, limiting it to my experience. Some congregations celebrate Holy Communion every week, some less often (1st Sunday + special holidays is common in my experience). My wife's former Free Methodist congregation very rarely did when we attended. That was jarring.
huh! TIL. I always figured celebrating Communion is a big part of going to church at all! But there's a great big world out there of folks who clearly feel differently.
There is so much variation from church to church, on almost any subject. Personally, I like regular Communion, but I know my church preferences skew to liturgy and ritual.
This is bizarre to me, taking the Lord’s Supper on the first day of the week is like a foundational thing in my birth church, to the point that they offer it for Sunday evening services if you weren’t there Sunday morning
Once a month for United Methodists.
As far as I know a lot of Protestants only do it once a month
Catholics offer communion every day, and most practicing folks take it once a week. The Catholic liturgical calendar has no bearing on whether communion is offered