No; how the cascade works, there is no way to cancel the !important declaration or make it "immaterial".
This is regardless of whether the rule is executed in different @media rules or elsewhere in the stylesheet. This means that it is the same as if you had no media queries related to it:
aside[role="attend"] { margin:0 !important; } aside[role="attend"] { margin:0; }
Which, by the way, is what the browser really sees if both min-width: 55.5em and min-width: 61.5em .
You are much better off finding a way to remove this !important and use a more specific selector in your first @media .
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