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UnregisterEventFromAllFrames
This is a user-defined function that you can copy and paste into your addon. Replace <PREFIX> with your AddOn's prefix to avoid conflicts between different versions of these functions.
Globally unregister event.
Code 
Edit
local function UnregisterEventFromAllFrames_helper(event, ...)
for i=1,select('#', ...) do
select(i, ...):UnregisterEvent(event)
end
end
local function UnregisterEventFromAllFrames(event)
UnregisterEventFromAllFrames_helper(event, GetFramesRegisteredForEvent(event))
end
Example Edit
-- Globally unregister the event 'MERCHANT_SHOW'.
UnregisterEventFromAllFrames('MERCHANT_SHOW')
