embed external link in event

embed external link in event

Is it possible to include a link to an external site within an event entry.  For example, I want to put an event on the Calendar in our project, but it is to an external event.  The information and registration is on an Eventbrite site, so I would like to include the Eventbrite link in the Calendar Event.  I have tried to paste into the comments the http://......, but it doesn't seem to work