From the CME Globex Control Center, here is the summary of KEY changes, per CME market segment
Thursday, December 24, 2020 - Early Market "CLOSE" - CST (Chicago)
*Any open positions must meet Exchange Maintenance Margin 15 Minutes before CLOSE.
CME Group Christmas Holiday Schedule December 24 - 28, 2020
View Full List: https://www.ampfutures.com/trading-info/holiday-hours/
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