I don't know if it will work but you could try adding the HTML code for the graphic into the event's title field.
Alternately, you can try modifying the code as shown in the previous forum messages linked from the "Links" section of the Unofficial CalendarScript - Mods and Plugins about coloring the event title under "Event display mods" to display a graphic instead.
Lastly, if ALL events entered will use the same icon, the default.html file could be edited to display the icon instead of printing out the event's title.
Dan O.
[This message has been edited by DanO (edited February 26, 2004).]