What do you mean drop an embed code in the custom html header? 

Do you mean custom html widget? 

if you place it in the custom html widget, this video will be visible on the page where you placed your custom html code, like main, dashboard or maybe profile unless you put in the sidebar

If you create a new a page,  you could put the code in there and have a whole page dedicated to your event with a page header/footer link. 

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