v. 3.6.84 only applies to Joomla 4 or 5.
I just tested a Joomla 3.10.12 site with an update URL set to
https://www.jevents.net/newupdates/package_jevents.xml and it correctly offered me version 3.6.82
I also tested a Joomla 4.4.3 site (a soon to be client!!!) which identified version version 3.6.84
Do you have problems with the actual upgrade?
What version of Joomla and PHP are you running?