Thank you for the suggestion! I have yet to fully deep-dive into using API but I guess I'm going to learn now 
One option is to create an "Interesting Moment History" field - where you store a continuous feed of IMs each time a new one is triggered; and an "Interesting Moment Score" field. For example, here's how we capture these when someone attends an event:
The default choice value for when the IM is appended to the existing history value is as follows:
{{system.dateTime}}: Attended an Avanade Event: {{trigger.Name}}{{my.line-break}}{{lead.Avanade Interesting Moment History}}
You can then run a report where IM Score > 2 (to ensure your report only includes those people with at least 2 IMs).
We use the IM history field in both our reports and real-time alerts (to sales and marketing). Here's an example of how this appears within our real-time alerts (we do the same thing for web page history):
Think of this as a poor man's way of reporting on Marketo Sales Insight (MSI) data without having to purchase MSI!
I presented on this technique at Marketo Summit (as part of my "Strengthening Sales & Marketing Alignment: Developing Real-Time Alerts with Rich, Actionable Insights" session). Here's a copy of the presentation deck (which also includes a great tip provided by Sanford on how to create a simple velocity email script token to insert hidden line breaks between each entry in your history field and make each entry readable within your reports/alerts).
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