The planning page of the event consists of 2 tabs - Preliminary Planning and Real Plan.
The preliminary planning page is used to create the preliminary plan for the event. This will use the unweighedin count of boxers to where you can prepare and create a preliminary schedule for the event. This is useful to estimate how many rings / how long the event will be. There is also a autoplan button that tries to split the groups evenly across all rings / timeslots, placing the finals on the last day, and the semifinals on the day before that etc.
The real plan is used to actually plan the matches of the event. This will start filling in with matches to place once either the groupes are locked, or the draw is done. It will not let you plan groups that are not ready. However if you have done a preliminary plan it will be used to place the matches in same positions as the preliminary plan.
The real plan also has a sort button next to each ring. This is active when there is a blue ring around it. This will re-sort all the matches in that ring based on, females first, then age, then experience of the category (number of matches required to enter the category), then weight. If not active, new matches placed in the ring will be placed at the bottom of the list.