There is nowhere on Google Calendar that you can link an event to a website.  This would be fairly easy to integrate into the edit box.  I don't understand why I'm the only one that is alerting Google to this need!

For example:  If I am going to a trade show on such and such a date I could have the link of the website of the company sponsoring the event.  It would be very handy.  Many online calendars have this ability.  To me this is a fatal flaw.