I agree with Lola. The stipulation is no work, paid or unpaid. It can get their backs up over something as silly as winning a cash prize in a Karaoke contest.
Some advisors, including me, have it in mind that there are actually 4 categories: paid, unpaid, emergency, and charity volunteer, and that some types of the last two are allowable under the rules. But if you were going to try it, you would absolutely get professional advice first.
And what the Avon lady told you was total kak.