Yeah, it's called "where two or more are gathered together" and the Lord Jesus Himself is there with them. There is your "church" and Christ Jesus is the Head.
Sure, and when they decide to celebrate the Lord's Supper they do what?
You're interpreting it as a reason why Christian churches don't need altars, even though virtually every such church does, and all the ones I've ever been in did.
Now a 2 minute wedding I can understand, but Communion works better served from a table.