Afterparties/Underground SC

BigYansh69
Just wondering. A couple of acquaintances have mentioned underground clubs to me in my locale, such as this example. - www.instagram.com
Any do & don't about these spots? Any review guidelines esp. since they constantly change locations? Anyone have a great/ terrible experience at one of these in your own city?
Comments
The only think I’ve heard of like that in Atlanta is something at an adult toy store called Tokyo Valentines but I really don’t know anything about it and it’s a gay hangout. I think there are enough clubs where the underground aspect isn’t really necessary.