The right of withdrawal under consumer protection regulations does not apply to services related to leisure activities, such as festival or concert tickets, when the contract provides for a specific date or period of performance.
This is established under European Union Directive 2011/83/EU of October 2011. As outlined in this Directive, the 14-day cooling-off period does not apply to all purchases.
Further information can be found in Article 16, paragraph (l) of the Directive, which details the exemptions to the right of withdrawal for time-specific services.