under All events, Search for your event.. First Identify which field is having the name in the Event Details.
Next go to Build > Rules and edit the rule that is sending the email message.
Find which Email template its assigned
Go to the relevant email template
Then edit the appropriate template which you have noted in above step
Add the fileld in the email template which is having the node name.
Also add event info and extraneous info in the email template.