Hey Grace-
you are absolutely right, that was misleading.
I was talking about your second case. That is why we do not know the actual date.
All good
Terminology can catch us!
Let's call it "lead activity" for the sake of clarity. From your original question, it sounds to me like what you're looking for is an absense of a desired lead activity. When you don't know the date of something, you want to use a trigger campaign. So for your two scenarios (not filling out a form, not interacting with an email) I'd look to do something like this:
A:
- Smart list trigger: Visits web page (webpage is X) + any refining filters
- Flow step: 1. Wait x minutes/days, 2. Send email - Choice 1: if not filled out form Y, send email A; Default: Do Nothing.
B:
- Smart list trigger: Email is Delivered (Email is X) + any refining filters
- Flow step: 1. Wait x minutes/days, 2. Send email - Choice 1: if not clicked/opened email X, send email Y; Default: Do Nothing.
You can't trigger on something not happening, but you can trigger on a precursor activity - basically, you want to find what that activity is, trigger on that, and then wait a period that you should reasonably expect the next activity to have happened in, and action your flow steps if that activity is not recorded within the reasonable period.
Make sense? Hopefully that answers your question 