Water coming through ceiling fan next to air vent

Check the A/C drain lines, check the A/C refrigerant lines.

99% probably condensation that's running to the lowest spot around the fan.. The moisture is collecting around the cold duct just like condensation forms on a glass of ice water.
Is there insulation wrapped around the duct?
Check it from the attic side. If it's dripping that much, it should be easy to find.

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Does this leak come close to a bathroom area?

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No, pretty far from it actually.

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Is there insulation wrapped around the duct?

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There is but it's starting to be worn out and old. I have been in the house for 11 years so it's at least that old.

Something is cold and getting warm exterior air flowing around/across the cold area. This could be the fan getting cold air blown on it and some warm air is leaking thorough ceiling around electric box and condensing on cold metal parts.

More likely is a either a duct or refrigerant line has compromised insulation. Or more specifically, the vapor barrier around the insulation. On a duct this is the outer foil layer. On suction refrigerant line this is the armaflex (looks like pipe insulation). Its a closed cell foam that does the job of insulation and vapor barrier.

If either of these has a broken/leaking vapor barrier it will allow the humid-arse attic air to find the cold duct/pipe and start condensing water.

This should be easily sussed out by going up there and seeing if either a duct or refrigerant line is in an area for it to be possible to drip down near the fans electric box.

thats a good point and something I left out. Ducts can be perfectly sealed but If they are half buried in insulation, that can insulate the vapor barrier jacket and drop it below the attic dewpoint. Code in most places it that the ducts must be hung above the attic insulation. Counter-intuitive for sure.