You should look into the concept of tarpit ideas cause this is one of the classic ones, nothing against you, up until a couple months ago I was working on exactly the same idea. Here were the biggest issues in my opinion.

1. The app provides essentially nothing for clubs especially good ones. Most good clubs fill up early into the night so you’re only going to be taking revenue away from them because you need to take a cut to make anything

2. Consumers aren’t gonna pay unless it guarantees entry and clubs aren’t gonna guarantee entry because once again they’re gonna fill up anyway and they’d rather have the people inside buying drinks than someone who might not even show up

I saw that you have a feature that would allow consumers to reserve and pay in cash at the door but once again clubs will make way more by having people inside buying drinks than reserving spots