In recent times, especially after Prop 8 passing, and misguided blame directed at the Black population, I've read a couple things that compared the "church" in black culture to the "bar" in gay culture. Basically, they both serve as the standard community location or hangout. Being a part of both communities, allows me to experience both. And list my own comparisons.
Segregation: Black churches are different from white churches, and are different from mixed churches. Mixed churches even have their areas where "like" people will gather, based on age, country, income, profession, race school they went to. Very similar to the bar scene.
Fads: A new church was recently started a year or so, ago. And now, it is the main places for younger people to go. A number of other churches have just lost their regular members. Just like what Town did to Cobalt.
Music: The music at churches do vary pretty much. Certain people will use that specifically to determine where they should go. Music is a key ingredient to setting the atmosphere, so it definitely invokes strong opinions and influences church attendance. I think of TNG events, and a number of occasions where people have said they don't a certain gay establishment because of the music. Also, certain songs are good and so traditional that a huge portion wants to, and may just start singing at random times. The equivalent would be showtunes, or a glee ivdeo clip. Guests DJs = Special music acts in church. The secular song "Last Night a DJ saved my life", I'll here or read the same thing in a facebook status about some random choir. Also, certain times a song may drag on and on, some enjoy it, others don't. This definitely happens with certain DJ's that either overplay a song, or play a techno track that'll be four different songs, but all to the same exact beat.
Parking: Get to some churches too late, and hopefully you can find a parking spot within 3-4 blocks. Its definitely comparable to nights in DC.
Friendships: Being at the same church over and over, and go to potlucks or other social events gives you an area with like minded people, which makes it easy to form friendships. In my denomination, if someone moves into the area, they will probably go to a church with the expectation and hope of meeting new people and making friends. Similarly, the first place a gay person would go is the local gay bar. I'm not saying they are the only places a black or gay person would go... but they are the easiest and have high success rates.
Weekend Scheduling: Churches have regular meeting times and regularly scheduled events. This predictability allows for people to always have a plan, or know that they can rely on it at given times. In NYC, the SDA church is especially good for this. While in highschool, my roommate spent many weekends basically at the church. Saturday morning service, then a lunch in the afternoon at church, then hanging out till the afternoon/evening service, then maybe a social or church league basketball game, then its already 1-2am. Then on Sunday, we have our own version of boy scouts, called Pathfinders. Since you're friends with all these people as well, its definitely an awesome time and not as bad as it seems to an outsider.
The bar scene is the same way. Certain places have drinks at the right price at certain days of the week. And events, drag bingo, trivia, karaoke, happy hours, college nights, theme parties, free drink hours, underwear contests... One can easily schedule and entire weekend filled with just bar hopping, club going, brunch and McD eatings, and then the weekend is over. and especially since people tend to travel in groups and cliques, you're with friends so it can be an awesome time.