The Required Dress Code

The required dress code
To join that private party
With some experts I know
Supposedly the best are there

In the hotel entrance
The choice will be restricted
Have you invited some more?
Might be too late to change that
List closed
High on booze
Gamblers lose
An intruder
All can do better
In this branch
No one loses
There's no clue
All can do better
Service Starts 8PM
There are less people than expected
Where's the spoon?
Service here is hell
Some well-known practices
Are useful in their meetings
There is something rotten
In the state of Denmark
Dissolving the new substance
That makes a drop like an ocean
Guests will taste in this party
Some of them will spread it today