Hi Krispy...
Yes, I have been to several tent meetings. I have often wondered about the reasons that such meetings seem to be so effective. I feel that tent meetings (and camp meetings, outdoor services, etc...) allow people to attend without forcing neo-modern religious traditions upon them. In my opinion, the only thing worse than traditional extrabiblical religious customs are the modern extrabiblical religious customs.
Such non-traditional meetings often allow many people to realize that God is not confined to a church building, chapel or fancy dress clothes (your "Sunday best"). If God can meet you on the saw dust covered grounds of an old tent, then God can meet you anywhere.
The most amazing meetings that I have ever attended were with the Tarahumara in the remote Sierra Madre Occidental mountains of southern Chihuahua, Mexico. Their church meetings were held beneath trees, in caves, or in the log cabin sanctuaries that were built by missionary teams in this huge mountain range. Electricity isn't available (and is unavailable to nearly all of the Tarahumara). There weren't any fancy sound systems, pianos, organs, hymnals or choir robes. There weren't any "day care" services available. There weren't even any chairs. But the Lord visited us mightily during those meetings! The Tarahumara live primarily in caves with little to no modern influence, so most of the visitors had [u]never[/u] heard of Christ. Since converts to Christ are often harshly persecuted amongst the Tarahumara, the tears and cries of repentance in those meetings were almost certainly real.
I have often wished that all believers could experience the simplicity of the faith as is known by the Tarahumara.
:-)