Should I let them know

[Ghanagirl]

Just found out one of the girls who came to my twins party has chickenpox, was likely contagious on day of party. Should I let other mums know?

Yes. Particularly in case any of them is pregnant or in contact with anyone immune compromised, but also so they know to watch for signs in 2 weeks.

Yes definitely

Definitely and asap. So maybe let the class teacher know so she can let the class know.

If any of the kids were on a high dose of steroids then they may need antivirals asap. So it is very important to act quickly. I would inform the school because they may know which parents need to be notified.