Pause notications in OSX whilst in a meeting I use the in built reminders application in OSX 10.10.5 which pops up notifications to my screen, this is also true for mail and iMessages.

This is great most of the time, but when giving a one to one presentation on my laptop or mirroring my screen to an external display via an mini display port to HDMI cable or via an apple TV, this has the danger of flashing up personal information to the screen. 

Is there a "meeting mode" i can enable to temporarily pause notifications popping up to the screen. I still want to reminders, iMessages, mail etc to give me notifications but would like to be able to toggle / pause them without having to go through system prefs.
When you click on the notification icon in the top bar, you can select "Do not disturb" there by clicking the icon and scrolling up, the setting is hidden above the first notification. You'll see that the icon is greyed out to show the change in state.

As a shortcut you can click on the notification icon in the top bar whilst keeping ⌥ ALT pressed to go into "Do not disturb mode". 

Notifications won't show up now!