I think it's very sad to do so many events, all with quest to infiltrate a sector, scout a province, get a province, etc. Some people want to fulfill all the quests from beginning till the end but that's impossible for advanced players as it's very difficult to scout and get provinces so quickly again and again. Moreover, some players playing in future have no area to scout, no area to get, they already have everything.
Maybe I have a solution. Some extra maps escpecially for events. There would be few extra maps, you choose one of them for an event. Units in the map would generate according to player's city age (e.g. for Collonial age there would be units from Collonial age). Also the players which have no possibility to scout a province will have chance to fulfill the event. If the player gets some part of the event map, after the event there could come some aboriginals and they can fight the event map back and the map will be hidden
Second possibility is to avoid player skip quests in map.