From mega trade shows to small individualized meeting.
Would it be ok to write "meeting" with no "s", or it would be more accurate with an "s" just to make it plural and go parallel with trade shows?
You could write it without an s, but you would need an article:
From mega trade shows to a small individualised meeting.
Whether you put meeting in singular or plural, your sentence has a different meaning. If you mean to say that it goes from multiple mega trade shows to one individualised meeting, you put meeting in the singular form. However, if you mean to say that it goes from multiple mega trade shows to an equal amount of (or even a different amount, but still more than one) meetings, then add the s for the plural form:
From mega trade shows to small individualised meetings.