If you like to stop receiving notifications about yourself (Sender Events) or your colleagues (Colleague Events), please visit your Preferences section of Yesware.
1. Click on the Yesware menu in the top-left of Gmail.
2. Choose Preferences > Compose Options.
3. Toggle off Sender Events, which will turn off notifications when you open a tracked event, and/or Colleague Events, which will turn off notifications when a colleague opens a tracked events.