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Because there wasn't a Calendar in Classic. The stock UI (including the bags/micro menu that were moved in Legion I think) should all be back to the way they were in vanilla.
We don't know what from the "post vanilla" (for want of a better term) api might bleed though for use in creating addons for Classic. Probably very little if anything.
It will probably also be a while before addons are enabled in beta for testing so all it's only speculation until then.
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