Is there a common expression to describe a situation where everything comes together perfectly?
UPDATE: The phrase that kept going through my head was "perfect storm," but that holds more of a negative connotation.
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You could consider when the stars are in alignment (or when the stars align)
When an unexpected and nearly impossible event takes place. Usually due to pure luck or the divine intervention of God.
Or if you want to wax more lyrical
When the moon is in the Seventh House
And Jupiter aligns with Mars
Then peace will guide the planets
And love will steer the stars
That will be the dawning of the Age of Aquarius