[snip] 

I don't know if I understood correctly your concern, but in my case if I go in Hosts --> Events 

and double click on a line I have a pop-up window named "Event Details" where I can copy  and paste "ID" "Time" and "Message" fields' values.

Not so friendly but it works

I don't know if from the Rest API you can also filter the kind of events to display, but at least you can do something like:

curl -X GET -H "Accept: application/xml" -u $(cat ident_file ) --cacert /etc/pki/ovirt-engine/ca.pem https://engine_fqdn:443/ovirt-engine/api/events | grep description

HIH,

Gianluca