Meeting

[Xinfu]

15/12/3 T
-The Federal Open Market will make a decision __ its next meeting on December 15th and 16th.

Do you agree with me?

on=about, related to, etc.
in=during

[Rusty]

I would use 'about' or 'related to' rather than 'on'. Your proposal may be fine in BrE.
Your comment about 'in' is correct.

[Xinfu]

Excellent answer. Thank you.