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I am the person that will be helping you today.
You are correct when you mention that a Google Doodle will not appear every day. Generally speaking, they will show a Doodle one or two days out of the week.
There will be a Google Doodle tomorrow for Labor day for sure. You can wait for tomorrow to see the doodle your can take a sneak peek at it at the following page: http://www.google.com/doodles/labour-day-2015
I will be standing by.