How can I include multiple hyperlinks in an ical entry?

When I create an event in ical, I can add one hyperlink. I'd like to add more than one. I have searched for info on this, but the best I've found is here. Using Option-Return to go to a new line doesn't work. I can put multiple urls in that way, but when you click on one of them, all urls are treated as one long string and passed to the browser.