Why did I only get one confirmation?

I sent two  registrations for Ricki Tim's classes with the rio Grand Quilt Guild show - one was for Design & Composition & the other for Ricki Tim's concert but only received the confirmation for the Design & Concert.Can you tell me why?

I checked the email logs and I found two emails sent to your email address:

Could you please check if the other email didn't end in Junk/Spam folder by any chance?

We'll wait for your response.

Thank you!