One click and be ready to go up on stage and shine! - https://zehfernandes.github.io/pliim/

pliim-turnOff.scpt

# Turn on Notifications
do shell script "defaults -currentHost write com.apple.notificationcenterui doNotDisturb -bool FALSE; defaults -currentHost delete com.apple.notificationcenterui doNotDisturbDate; osascript -e 'quit application \"NotificationCenter\" ' && killall usernoted" -- this set  'Do not disturb' to false in the pref

# Show Desktop
do shell script "defaults write com.apple.finder CreateDesktop -bool true; killall Finder"

# Show all windows
tell application "System Events"
	set visible of (every process) to true
end tell

pliim-turnOn.scpt

# Disable Notifications
set tDate to do shell script "date -u \"+%Y-%m-%dT%TZ\"" --  the current date in UTC time. --> "2016-04-04T17:03:04Z"
do shell script "defaults -currentHost write com.apple.notificationcenterui doNotDisturb -bool TRUE; defaults -currentHost write com.apple.notificationcenterui doNotDisturbDate -date " & tDate & "; osascript -e 'quit application \"NotificationCenter\" ' && killall usernoted" --this  set 'Do not disturb'  to true in the pref

# Hide Desktop
do shell script "defaults write com.apple.finder CreateDesktop -bool false; killall Finder"

# Hide all windows
tell application "System Events"
	set listOfProcesses to (name of every process where visible is true)
	repeat with appName in listOfProcesses
		if {"Sketch", "Keynote", "PowerPoint"} contains appName then return
		tell application "Finder" to set visible of process appName to false
	end repeat
    listOfProcesses
end tell