Astrid Appels for Eurodressage does something similair, I think. She travels to all the big events and reports on them. I want her job!
You may want to contact her to see what is involved, and how she funds it etc etc etc. I know you're looking at a different area, but you'll still share some of the same issues of travel, best way to report on something, how to best use the media and websites Contact | eurodressage