Brain Teaser 3/28/2015

My first is in yesterday, but not in today;

My second is in after, but not in before;

My third is in start, and also in stop;

My fourth is the 20th letter of the English alphabet;

My fifth is in correct but not in wrong;

and my sixth is in pretty, but not in cute.

My whole is something celebrated by Christians.

What is this teaser referring to?

Solution

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from A Daily Brain Teaser http://ift.tt/19s09Vk

3d wooden brain teasers from craftypuzzles.com