If cancellations are permitted, they must be made in writing. If the event cannot take place due to force majeure, the inability of a speaker to attend, problems at the venue or due to a lack of attendees, the attendees will be notified without delay. No charge will be incurred by the consumer. The Ticket may only be cancelled if the event's website states that cancellation is actually possible. Consequences of cancellation In the event of the right to cancel being effectively exercised, the relevant tickets or ticket-voucher codes will be blocked so that entry to the respective event will not be possible. However, a replacement attendee may be named.