I am looking for a word for removing the provisional or tentative property of something, in particular meetings.
I would like to use this in the context where I set up a provisional meeting and anyone from a group can make it "definite" and the meeting is going ahead.
Is there a word to describe that action or the outcome (even saying a meeting becomes "definite" does not sound right)? Ideally it would be a word that can be used in a professional context, i.e. most people would know what I mean if I use that word.
An example sentence could be:
"I have set up a tentative meeting for 2pm. It can be
??? by anyone present if the situation deteriorates."
"I have set up a tentative meeting for 2pm. Anyone present can declare it
??? if the situation deteriorates."