Hi Yoko,
I agree with Sean, you can only do that with a PDF. However, to save yourself a lot of headache and trouble what I would suggest is post the JPG to the website as is and then type out (or paste) the links in the description of the event below the JPG on the website.
So for those who want to refer people to the event, just send them via email the link to the website where the event is posted with all the links.
That will be easier on you and you don't have to fuss around trying to make the links work on the JPG. That'll be too much trouble IMO.
Aloha,
Rebecca
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Rebecca Meeder
Graduate Assistant
University of Hawai'i - Manoa
College of Education
Educational Technology
mee...@hawaii.edu