Add custom field or used something already here

[menardmam]

I like to be able to add a picture LINK to a event. Here an example. Event : 12-03-2012, title : please visit us, text : bla bla bla. hosted : Linda

So it's a Linda event, i like, before the post list, to show a photo of Linda

How do i do that ?... add a custom field named : photo
or use a category, but i dont want that category listed under category

It's really a custom field i need....

how do i add this ?