What would be the proper abbreviation for an event that has yet occur?

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Track title: Industries in Orbit Looping

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Chapters
00:00 What Would Be The Proper Abbreviation For An Event That Has Yet Occur?
00:55 Answer 1 Score 4
01:23 Accepted Answer Score 2
01:43 Answer 3 Score 0
01:56 Thank you

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Full question
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Tags
#terminology #abbreviations

#avk47

ANSWER 1

Score 4

If the event is supposed to take place:

and you know the date, but aren't ready to announce it, use TBA.
but the date isn’t known because it will take place only based on other events being completed, use TBD.
and you know the date and can announce it, put the date.
and only a relative date is known, use 2 weeks after Event X.

ACCEPTED ANSWER

Score 2

You may also see TBC - To Be Confirmed. This can be applied to several details (e.g., date, venue, lineup etc.)

ANSWER 3

Score 0

An interesting Ngram in American English...

TBA and TBD

British English shows TBA ahead the whole time.