I would suggest it is totally fine, expecially if there are RP reasons behind it, such as that wedding.
But then I also think that a noble leaving the realm when they are needed to go off and play in a Tournament is very irresponsible on the nobles point and should be IC punished. To do so otherwise allows OOC to trump IC which i've always considered as bad roleplaying and the sign of a bad roleplayer
To elaborate a bit, the purpose of the IRs can be found on the wiki:
"These rights are
OOC fun-preserving tools. They are meant to guarantee you, the player, can participate in the game properly."
Note the emphasis on 'OOC'. They are rules that exist outside of the game to protect the rights of players, not characters, and they are deemed important enough by Tom to warrant trumping IG considerations.