Another thought, which is something I did, was to make a jpeg of the printable calender made up by my favorite team and found on their website in pdf form. That way I just keep it in my gallery and have easy offline access.
However, I was able to successfully import my team's sports calender and load it to my Droid's calender. I logged onto my Google account on my computer, when to my calender, and followed the directions on my favorite team's website. I thought it was pretty easy, so I'm not sure what issue you guys are having.