I just disabled the Mega Events DLC also.  Started a new game.  2nd turn: "Galactic Event - Ruthless Vision - While on a deep space survey, one of our ships..."

Then I picked a choice and clicked OK, and right behind that came "The Scout"  Two events in one turn.

Arrgh.

Those lines of data may be found in GalCiv3GlobalDefs.xml (some mods have a modified version of this file, such as the AI tweaks mod, for example). Apart from the file being modded, that is very strange & crazy behaviour 

AI Tweaks does not mess with the Galactic Events modifiers.

I am vanilla and also see many notifications of events. And no I have not done what Enskipp did.

I would love to get an event every 3 turns option in a game. What a wild and crazy game that would be!

For anyone interested in stopping this from happening, go to your Mod folder and open up the folder for the More Anomalies Mod. Open the Game folder, then open MA_AnomalyDefs.xml in a text editor.

Add an 'open comment' <!-- before MA_GE_Artifact0, like this:

<AnomalyGroup>
<InternalName>Artifacts2</InternalName>
<DisplayName>ARTIFACTS_LABEL</DisplayName>
<Weight>10</Weight>

<!-- REMOVED TO AVOID EVENT SPAM

<Anomaly>
<InternalName>MA_GE_Artifact0</InternalName>
<DisplayName>MA_GE_Artifact_Name</DisplayName>
<Description>MA_GE_Artifact_Dec</Description>

[...]

Then put a 'closed comment' --> after MA_GE_Artifact15 like this:

<StringParam>OutbreakEvent</StringParam>
</PerformAction>
</Triggers>
</Anomaly>

-->

<Anomaly>
<InternalName>PBuildArtifact</InternalName>
<DisplayName>PBuildArtifact_Name</DisplayName>
<Description>PBuildArtifact_Dec</Description>

[...]

 This will stop the anomalies that trigger galactic events and prevent event spam on larger maps while preserving the other new anomalies. No criticism of the relevant mod is implied (I enjoy it).