There are various ways to properly plan for a presentation. From using a checklist or to-do-list to blocking multiple timeslots in your agenda. You could also think about using a Kanban board. Kanban was originally developed in Japan as a planning tool for production processes. It became also popular in the IT world, using sprints to develop prototypes.
You may also consider to use the Kanban board as part of the preparation process for your next presentation.
Identify the various things / tasks that need to be done as part of the preparation process and include these on a Kanban board.
When updating status on a daily basis and adding new tasks if needed you can work in “sprints” to get the preparation for your next presentation done in an organized manner.