I am uneasy about churches which limit membership by things like nationality, employment, or similar. I can't think of any biblical justification for such a thing. There wasn't a church for fishermen, a church for tax-collectors, a church for tent-makers. Of course, in a part of the world were there are many cowboys, local churches may have more cowboys in their membership than similar churches where I live, where as far as I know, there are no cowboys.
As I said, these men and women in my area work the cattle auctions, other animal auctions, and rodeos all weekend - most weekends.
They CAN'T be in church on Sundays and want to fellowship with other believers. They found a local church that let's them meet on Tuesday nights and they have an ordained pastor. It's advertised as a cowboy church to let people who work as they do that there is an option to Sundays in which they cannot meet.
It's not a segregated membership. Anyone can attend although the majority are the cowboys and cowgirls. It's not a costume day. Jeans and hats are their daily wear.
Their only other option is to not attend church at all.