According to Official Ticket website in.Bookmyshow.com,
CL T20 tickets will be valid until the relevant Match has been completed or is reasonably deemed by the Board of Control for Cricket in India ("Organiser") to have been completed. This Ticket may not be exchanged or used for any Match or event other than that indicated thereon. If the Match is cancelled or curtailed for any reason, there shall be no obligation on the Organiser to reschedule the Match. The Organiser reserves the right to make alteration to the times, dates and venues of Matches or to substitute the seat or area to which this Ticket refers at its reasonable discretion. The Organiser does not guarantee that the Holder will have an uninterrupted and/or uninhibited view of the Match from the seat provided nor does the Organiser give any warranty as to the quality, content or duration of the Match. Refunds (less any applicable administration fee), if any, will only be made if the entire Match and all other Matches scheduled to be played on the particular Match day at the Stadium are cancelled without a single ball being bowled in any of those Matches. No other refunds will be made.