The built-in synchronization of the Android operating system respects the default reminder settings of the Google web calendar. Therefore reminders for every new event will be created, if default event reminders are set up in the Google web calendar.

To change the settings in the Google web calendar follow the steps below:

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1. Please open the Google web calendar (calendar.google.com) in a web browser of your choice and sign in with your data




2. Click on the small arrow next to → My Calendars and choose → Settings in the pop-up menu

3. Now click on → Reminders and notifications of the affected calendar(s)

4. Remove the unwanted reminders and save the preferences for this calendars

Hint: if you don't sync your calendars or cannot find the above settings set up, please go to → Settings → Standards for new events/tasks/birthday and take a look, if you didn't set up a standard reminder for new entries. Please make also sure, that you didn't set a template with reminders as standards for new events either. More details can be found here.