Originally posted by Lou Zephyr:

when a raid is happening, can i just teleport to another base and spend a few days there until it is over at the other base?

You have to remain in the event area until the timer is done, i believe it's 2 minutes. You do not necessarily have to engage with the raid during this time (especially if its a land based raid that wont actually successfully spawn at your island) you just have to be in the area (though this also means that if you do build under an instance like a dungeon, going inside the dungeon even though the dungeon itself is in the area, does not actually count as being in the event area). If it's a raid that can still spawn but they cant actually end up breaking much, like bats, then you might just be able to ignore the raid entirely from the safety of your base.