Is it good that I'm not going to one of my best friend's kid's first birthday party because of the coronavirus ordeal?

It's gonna be at a petting zoo. My friend's family is huge and I'm pretty sure there's even gonna be people flying in...

She had asked for a headcount and said she would understand if people don't come because of everything that's happening. A few people responded and I'm the only one who's choosing not to go. Even my friend with an autoimmune disorder is going even after I told her she's an increased risk. She was like omg but apparently she's not scared enough... 😒