[How to have an event display on only one calendar]

I am using the Trumba calendars for a school district. There is a main calendar for the entire district and 10 calendars, one for each of the 10 schools in the district. I want to put an event on one of the school calendars and have it show up only on that one calendar. It currently shows up on the district calendar when I have all the others mixed in unless I mark it as private. But when I mark it as private, it doesn't show up on the published school calendar. Is there a way to make it only show up on the one school calendar?

[Trumba Hosted page]

Is it possible to make the logo I have placed in the upper lefthand corner of my calendar page using the Trumba Hosted view, link back to my website?