The church building facilitates ministry. The ministry is what's important. It is more important for us to go than to invite them to come.
Praying is more important than programs. You can't plan a program without prayer. The people had to walk around the walls of Jericho and be quiet, obedient to God, before the walls came down.
The supernatural draws people, and it doesn't happen without prayer. I'm thinking about how people like to get by with as little studying as possible in school. The effective prayer of a righteous man availeth much.