This tool allows you to perform mass edits on events that have the same title. Start by choosing a start date and end date, choose which calendar you want to work from, and click the Get Events button. That will search your calendar and list any events that show up multiple times. In order to edit details of those events, select the event you want to edit, click the checkbox next to any properties you want to change and then click Edit Events...
This tool allows you to delete multiple events that have the same title. Start by choosing a start date and end date, choose which calendar you want to work from, and click the Get Events button. That will search your calendar and list any events that show up multiple times. Select which events you want to delete and which day(s) of the cycle you want to delete from and then click Delete Events...