I thought that I was being phished until I queried Carol's name and e-mail address. I signed back into the competition registration page and verified that I did not check any boxes that I did not intend to check. The competition registration page allows one to sign up to judge or steward, but not both.
With that said, Carol's message was directed at people who volunteered to work at seminars. I do not recall signing up to volunteer to work at the seminars, which is why I was surprised to receive the e-mail message.