How do I express a chronological dependency between two events? Is it alright to say :
"Event A must be chronologically after Event B"?
Any suggestions are welcome.
Follow, postdate and succeed are antonyms of precede.
The meaning of postdate is different from what you seek, so you are left with
Though the meaning is not strictly the same to your example, as both of these also imply that Event A causes Event B, where your original statement does not. Therefore, the same meaning would be
Chronologically is implied with after.
Finally, to say
would mean the same as original statement.
Events, by definition, take place, (rather than just existing), which automatically locates them in time. So saying "Event A must take place after Event B" is both idiomatic and precise.