Send the meeting summary a little while after the meeting has ended. That way the summary will be first reminder for attendees.
Make time to prepare each meeting. A 15 minute preparation for a 45 minute meeting is better than 0 minute preparation for a 60 minute meeting.
At the end of a meeting, ask your attendees about how it went. Use this feedback to improve your preparation and facilitation skills.
Encourage participants to use voice, video, chat and whiteboard to engage in the meeting. More thoughts and ideas will become part of the conversation.
Create a template in your calendar app and use it every time you send a meeting invite. The template will remind you of what you need to include to prepare your attendees.