It's all about transparency
Santa has hidden your daily present on his server, somewhere on port 443.
Start on https://www.hackvent.org and follow the OSINT traces.
This is how the website looked like
To find the right virtual host I decided to lookup up all other domain names of 80.74.140.188 using passive DNS, namely this great tool.
One domain immediately took my attention: osintiscoolisntit.hackvent.org
After loading the website I got the flag.
HV18-0Sin-tI5S-R34l-lyC0-oo0L