If your administrator can redirect the entire
/Events/ URL in your GRA installation to your event system in IIS it would probably work the best. There are two places you could fix it in
SRP.Master but there's one reference to it in the badge details code which won't be as easy to edit (you'd need to recompile the software).
I've found the IIS URL Rewrite module to be the easiest way to effectively handle redirection in IIIS.
You'll miss out on my awesome structured data code and cool social media sharing buttons though!