In JEvents 2.0 you can customise the popup tooltips by editing them in the layout editing tool.
From JEvents 1.5.4 onwards it is easier to customise the tooltip/popups that appear in the monthly event window.
Assuming you are using the Joomla style tooltip then simply unzip and upload this file to templates/{YOUR TEMPLATE}/html/com_jevents/{YOUR LAYOUT}/month/ and customise the output (near the bottom of the file). You'll aleaady see the event description and extra info fields there (commented out for now).
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