The most important criteria of the participation in the competition is the knowledge of the WCA Regulation.

You can find it on the link below:
https://www.worldcubeassociation.org/regulations/

If you know the last version of the Regulation, you can find the most important changes here:
https://www.worldcubeassociation.org/posts/wca-regulations-april-2016

Regulation of the venue:

You must not use flash at the venue!

You must not drink any kind of alcohol at the venue!

Communication with actually competing competitors is forbidden!

Disturbing or pulling back the competition is forbidden!

Using other toilet other than the assigned one is forbidden!

By entering the venue, every participant accepts the rules of the competition.

The violation of the regulations may result in the disqualification from the whole competition.