>Ticketmaster’s Terms state they may be changed without notice and changes apply retroactively.
The use of passive voice in "may be changed" leaves open the opportunity for you, the end user, to change the terms in your favor. Just open the browser's web dev tools and change the source. Don't forget to print a copy for your records; you're probably going to need it when you bring the case to court. Or just print their original terms, cross out the offending ones, and amend to your satisfaction.
Heck, even without implied permission to change the terms, I see this as no different from somebody offering you a contract which you can alter to suit your needs, then submit back to them with your proposed changes.
The use of passive voice in "may be changed" leaves open the opportunity for you, the end user, to change the terms in your favor. Just open the browser's web dev tools and change the source. Don't forget to print a copy for your records; you're probably going to need it when you bring the case to court. Or just print their original terms, cross out the offending ones, and amend to your satisfaction.
Heck, even without implied permission to change the terms, I see this as no different from somebody offering you a contract which you can alter to suit your needs, then submit back to them with your proposed changes.