Hanging of the What?

Help mediate this disagreement between myself and my pastor.  last night at church we had a service called the Hanging of the Green.  I say it should be called hanging of the Greens since we are hanging multiple green things.  My pastor says that greens are something you eat for dinner and finds that unacceptable.  As far as I know, the word green is not a shortened form of the word greenery. So which is correct? I like to use my blog to solve minor disputes such as these.  So please take 2 seconds to vote on your preference.  And if you want to, feel free to tell me in the comments which is correct.

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