You might be asked to let calendar.google.com show notifications. You can change notification preferences for all your events on Google Calendar. : Click the Notifications drop-down and select how you want to receive notifications. Only get notifications if you respond “Yes” or “Maybe” to an event: Click the box next to "Notify me only ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.