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 are familiar with the Regulation of 2014, we made a short summary about the most important changes:
WCA Regulations Changes
Regulation of the venue:
1) At the venue all kind of selling needs the permission of the organizers. If you would like to do this kind of activity, please contact us! (The violation of this regulation may result in the disqualification from the whole competition.)
2) You must not use flash light at the venue! (The violation of this regulation may result in the disqualification from the whole competition.)
3) You must not drink any kind of alcohol at the venue. (The violation of this regulation may result in the disqualification from the whole competition.)
By entering the venue, every participant accepts the rules of the competition.