choose the lesser of two evils
To pick the less offensive of two undesirable options. I wasn't excited about going to a seminar all weekend, but I also didn't want to lose my license, so I chose the lesser of two evils and spent the weekend learning about new regulations in our field. Do you really want to get a demerit for not having your blazer? Just choose the lesser of two evils and tell the teacher you forgot it—maybe she'll take pity on you!