I need to add script to an event

Hi,
I hope this hasn't been asked before. I did a search on the forums but couldn't find anything.
I need to add a registration script to an event but cannot figure out how without it erroring out.
The following is akin to what I need to add.
Is this even possible?


<div id="bbox-root"></div>
<script type="text/javascript">
window.bboxInit = function () {
bbox.showForm('e4aab2e8-ada2-289da');
};
(function () {
var e = document.createElement('script'); e.async = true;
e.src = 'https://bbox.blackbaudhosting.com/webforms/bbox-min.js';
document.getElementsByTagName('head')[0].appendChild(e);
} ());
</script>