After the meeting, a quick follow-up is important to ensure the momentum is maintained. The first thing that needs to be done is that a summary of the Minutes of Meeting (MoM) should be sent out to the attendees. If any presentation was made, it should also be attached.
The MoM should clearly have the actionables with the names of the people who are responsible for them. Ideally, MoM should be sent out within 24 hours of a meeting. If any questions came up in the meeting that could not be answered, they should be replied to quickly.
In my own experience, this is where the impetus of a good meeting can be lost. Without the right follow-up, everyone gets busy with their own life and the memory of the meeting fades. So, it is very critical to ensure that the purposefulness is maintained.