I, too, think that raising or altogether removing the limit of events would be nice. Maybe it could be limited to the amount of provinces you have. I have few ideas of my own, too.
New events:
One of your provinces is searched for magic sites (one path and first level only) - national limits would make sense, but it works even without them.
If a province has a lab and a mage, give that province summoning/ forging/ enchantment etc. bonus for that one turn only. Stars and Planets combine to focus Astral power to that province or something...
And small changes to existing events:
Making the amount of gems found a random, open-ended roll.
Giving you some free sacred troops of your nation, amount dependant on power. That is, Flagellants limited to Marignon only, other nations would get Heart Companions, Vanir,
_a_ Niefel Giant, Wardens etc... More thematic, but for some nations a really nice bonus too.