When you’re under the weather, it’s your responsibility to make sure your germs don’t spread. That’s something, if we didn’t know already, we all learned a few years ago for no reason in particular. You don’t want to make other people sick if you can avoid it. It can be hard to skip out on stuff you may have wanted to do, but you know you have to do it. Not to mention, if you’re sick enough, you probably don’t feel like going anywhere anyway. But what if quite a lot of money was at stake? 

What if you didn’t show up somewhere and had to pay the price in a real way for your illness? You might be pretty upset about that. But ultimately that’s life and there’s not much you can do about it. You have to swallow your pride and do what is best for the group.