Assuming we’re talking about a meeting you attended and did not run, consider trying this:

After the meeting, allow some time to pass.

Then, flip through your notes and compose a quick email to the convener/facilitator of the meeting.  In that email, tell him/her what resonated with you, what challenged you in a good way, what you learned, or how your behavior will shift as a result of the meeting.

Bcc yourself on the email.

This practice will help you to reflect (a good thing), offer some feedback to the leader of the meeting (a great thing), and allow you to keep a running record, via the Bcc, of what you’re learning in all those meetings (the best thing).

It won’t cost you much.