It is not possible to transfer a ticket from one account to another, from person to person, or out of the wallet where it was originally minted.
Each person attending an ETHDenver event must complete the application process themselves, agree to the Terms of Service, and be accepted to the event.
If the original ticketer wants to cancel their ticket, they can submit a ticket to ETHDenver by visiting https://support.ethdenver.com - please use the subject "cancel ticket"