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The event id for the marriage is 'aegons_landing.13', so you can try using the console and triggering it the manually with
Code:
event aegons_landing.13
I never got the event to work properly myself despite having the obvious requirements fullfiled (like the Storm King being KIA, Aegon holding the Stormlands title etc.). The event for me gave the Stormlands title to Orys, legitimized him and gave him the proper Baretheon dyansty, but no marriage between Durrandon and Baratheon. So in the end I just married Orys and Argella manually (killing Argella's husband first) for it to be correct.
The dates are wrong, due to the bookmarks being pushed back 2 years. (currently 8000, where it should now be 7998). It's been fixed for the next update.