This probably will not help you since it requires you to manually patch the code, maybe someone else knows of another MOD. Read the thread carefully, some people say it works within forum blocks, others say it does not.
MOD: Upcoming Events
https://vborg.vbsupport.ru/showthrea...=231365&page=2
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This one does not do what you ask, but I listed it here for others that might read the thread.
MOD: Countdown to Calendar Event
https://vborg.vbsupport.ru/showthread.php?t=252146
Hope it helps