Right after a meeting, send a follow-up listing what you committed to, then block weekly time to process notes and act on tasks.
The idea
Commitments made across a table evaporate the moment you walk away. Two simple habits catch them. First, write them down and send them, because the act of writing and communicating a commitment locks it in, for you and for them. Second, give yourself a regular slot to process what happened in your meetings, so notes become stored knowledge and promises become done tasks.
How to do it
Right after the meeting, send a short email listing what you each agreed to do.
Do the quick items on the spot if you can. Future-you has a full plate.
Once or twice a week, block time to review recent meetings.
In that block, condense your notes, store them where you keep your contacts, and act on every open task.
Example
The classic failure is the end of a good coffee. You stand up, run through the list (send this book, make that intro, share that document) and, by the time you're back at your desk, it's gone. The follow-up email turns that spoken list into a written one you can't forget.
Do It on the Spot: When an intro or something to share comes up mid-conversation, do it right then instead of promising to; if it takes under 90 seconds, do it now.
The End-of-Day Debrief: A five-minute calendar block at the end of each day where you ask who you met and what you learned about them, and write it down.
The Engagement Manager: Dictate a 30-second outline after each meeting, have an assistant draft the follow-up, and spend a few minutes at day's end reviewing and sending.