Depression,
I would check this out as it may be suspicious!! Check any credit card statements also in case someone has got hold of any of your personal information in some form of identity fraud. A couple of years ago, my email address was hijacked and lots of fraudulent activity with that email took place on Ebay and it was an absolute nightmare to sort out. They had managed to obtain my password and sent emails to Ebay sellers and buyers about various items. I didn't even know they were using my account as they deleted all sent items and the first thing I knew about it was when I received about 100 emails from different sellers wanting their money! I know ticketmaster is not Ebay but the principal is the same.
It may very well be someone you know and it is perfectly harmless but in today's age of online fraud and ID theft its better to be safe than sorry.