As it was mentioned to register on three days that is from 11 to 13 .When i i went to the website it says that " Registration are for this event are closed".
now that you mention about confirmation. I am also wondering then I check email and saw this message
“Thank you for your interest in attending an upcoming Microsoft event. Due to the popularity of this event, your registration cannot be automatically confirmed. You will be notified by email if there is capacity for you to attend.”
So I believe due to limited seats ,not everyone is confirmed
Registration has been closed for long, as it is a very popular event so everyone didn’t get confirmation , instead this message is what we recieved
“Thank you for your interest in attending an upcoming Microsoft event. Due to the popularity of this event, your registration cannot be automatically confirmed. You will be notified by email if there is capacity for you to attend.”