I know that there's always something to be thankful for, always something to celebrate. As much as I admire and hold holidays, I also believe that you don't need a specific date on the calendar to celebrate. Life should be a celebration!

Celebrate:

acknowledge (a significant or happy day or event) with a social gathering or enjoyable activity synonyms: commemorate, observe, honor, mark, salute, recognize
reach (a birthday or anniversary). synonyms: herald, signal, announce, proclaim, usher in, introduce
honor or praise publicly synonyms: acclaimed, admired, highly rated, lionized, revered, honored

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From Merriam Webster:

Celebrate:

to honor (an occasion, such as a holiday) especially by solemn ceremonies or by refraining from ordinary business
to mark (something, such as an anniversary)
to hold up or play up for public notice
to observe a holiday, perform a religious ceremony, or take part in a festival
to observe a notable occasion with festivities

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Celebrate holidays, celebrate birthdays, celebrate successes, but don't forget to also celebrate life itself and all the little things that make living beautiful!