You can add a number to your Event Titles that increments with each Event. Click the button immediately to the right of the Event Title Window ( entitled Sequence) to bring up this pane:
The Sequence Tag can be any single character, or combination of characters, which you define here. When OddCal writes your Events to iCal, and that particular character (or group of characters) is found as part of the Event Title, a number is inserted in its place. You define the Sequence Starting Number in the middle box on the Event Sequencing Pane, and OddCal increments that number based on the Step Value you define in the bottom box.
In the example above, we have defined the dollar sign ($) as the Sequence Tag, and incorporated that into the Event Title. The resulting output to iCal looks like this:
