Apex domains cannot have CNAME records.
Question and response
Question
dig event-emails.com. NS
Answer
event-emails.com. 5 NS ns-1635.awsdns-12.co.uk.
event-emails.com. 5 NS ns-1053.awsdns-03.org.
event-emails.com. 5 NS ns-76.awsdns-09.com.
event-emails.com. 5 NS ns-585.awsdns-09.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0