I haven't tried this myself but there is an Activity was logged filter and within that filter there is an "Is task" contsraint. Set this constraint to false and that should leave you just with activites that are events in SFDC.
The Due date constraint then can be used to filter the particualr date of the event.
Then I guess you would have to do a bit of finger counting with the dates in order to set the schedule of the campaign.