Gentle Reminders

Prevent pop-up event reminders from bringing Google Calendar to the front of your screen. With Gentle reminders, the event's title will blink in the browser title bar or the tab that Google Calendar is open in.

If you'd like to prevent Gentle reminders from accumulating in the pop-up window, select Dismiss gentle reminder when event ends in Settings > Gentle reminders (labs).

You can also enable sound notifications with Gentle reminders by going to Settings > Gentle reminders (labs) and selecting the Play a sound notification together with reminders (requires Flash) checkbox.