A training session is the exercises and plan for a practice, attached to a calendar event so players and parents can see what's coming before they show up. Both Practice and Camp events support sessions — not just Practice.
Add a session to the event
Create a Practice or Camp event (see Create an event), or open one you already created.
Open the Session tab on the event.
In the Session tab, either:
Add an existing session from your training library, or
Create a new session directly within the event.
Edit the session for this event
Editing the session here doesn't touch the original saved in your training library — a duplicate is created for this event only. If you want to keep your changes, save the modified session back to the library as a new version.
Publish it to players and parents
Decide whether to publish the session when you finalize it. Publishing sends players and parents a notification so they can see the session details before the event.
Publishing the session doesn't affect anyone's RSVP to the event — see Respond to an event invite for that.