This is one of those debatable matters. Some condemn any consorting with the world as sin, and encourge you to "come out and be ye separate." Others point out that as long as you aren't committing a sinful act as indicated in Scripture, you're perfectly fine. Still others claim that when Jesus hung out with "sinners" (though in fact, a lot of those sinners were actually God-fearing Jews) he put the stamp of approval on partying.
In his letter to the Romans, Paul pointed out that "there is now no condemnation for those who are in Christ Jesus." Believers were encouraged to walk in freedom. Now it seems that, for believers living in a perpetual red light district, he had to clarify what that meant.
A couple of decades ago, when I was young enough to notice but too old to be interested, Christian nightclubs began to spring up. The idea was that young Christians would have a place where they could go out with like-minded young believers, and pretty much imitate what was happening in the secular nightclubs, but without the booze. Perhaps they edited the music also, and toned down the sexuality of the dance moves, I'm not sure.
The short answer to the question, "Is it a sin to go to a nightclub?" is "No. Walking into a nightclub is not inherently sinful." But like most short answers, there's a lot it's not saying. As one Christian once pointed out at our church, "Why are you there?"
Why do most people go clubbing? When I was in college we went partly because we enjoyed dancing, and partly in hopes of socializing with people in our age group. At today's clubs, if Hollywood is to be believed, socializing includes a hope of hooking up sexually, if only for the night. Talk about pressure!
Yes, maybe that's not why you are there. But that is certainly why some others are there, and they will approach you with that in mind. (Or has the young male mindset changed over the years? Or the old male?)
You also have to consider the point of what happens to you after you have entered the club. How much control do you really have over your thoughts? Can you be tempted if he or she is hot enough? (Don't answer that too quickly. It's easy to claim resolve when you're propped up on the couch with your house socks on and a cookie in your hand.)
But it's not just that the lyrics, alcohol and suggestive dancing can test your resolve to "flee from sexual sin."
Seeing as Paul addressed the problem with the Corinthian church (partying with unbelievers), his response to them also talks to us. When they were at social events with non-Christians, there was a good possibility that the meat that was served had been first offered to an idol. (See Chapter 8.)
Paul's response was that an idol is nothing at all in the world, and we serve the one true God. Food doesn't bring us closer to God, and therefore we are no better if we eat it, nor any worse. However some believers, knowing where the meat came from, have a problem with it in their conscience. In this case, whether you choose to eat (or party) is no longer all about your freedom. It's about how your actions come across to your brother or sister in Christ.
In verse 9, Paul says, "Be careful, however, that the exercise of your freedom does not become a stumbling block to the weak." You could encourage a brother to step into what they consider sin, and in doing so they are destroyed by your act of freedom.
An arrogant insistence on freedom can trip a brother up.
If protecting my brother means I don't go to Club 29 and have an Aphrodite burger, well then I can avoid that. For the rest of my life, if necessary. Because my brother is more important to me than any inherent right I believe I possess to party.
The other problem is how your actions come across to non-believers. Non-Christians can be stricter than Christians about what you can and cannot do as a model believer, and will get up in your face in a heartbeat. Seriously. Despite their scant knowledge of God and his Word, they will be quick to label you a hypocrite. Now I'm not saying you live to make unbelievers happy. We live for God and God only.
But if you ever desire to be a witness of a better life, a stronger faith, and a greater hope, then you'll see why in some instances it is important to avoid even the appearance of evil.
So, yes, I still enjoy dancing, but now it matters to me when and where I indulge. And maybe your issue is not nightclubbing or dancing. Maybe it's more about whether a glass of wine is permissible. Or R-rated movies. Just read I Cor. 8, take out the "food sacrified to idols" part and put in "having a drink." It might get you to the answer you need.