In this post I will talk about recent innovation in Codeforces.
It is noticed that many coaches used the opportunity to change the start of the training/rename it for personal purposes (to host group trainings). This leads to confusion and inconvenience for other members of the community.
To keep everything in order, we changed the rules for editing gym contests. Now a coach can change the name/start time/description of a gym if it is not public or the last update was made not later than a week ago. A week after editing a gym, it becomes the history of Codeforces and coaches lose an opportunity to make edits in it.
You cat ask "how do you give a training in a group, specifying the start time?" Now there is such a way!
To allow more convenient re-use of past trainings, as well as regular contests, it was possible to copy past training and regular competitions into a mashup. This can be done by clicking on the corresponding button in the right sidebar or directly in the form of mashup creation.
In the copied mashup all the submissions of participants of parent contest, the statements of the problems and other information are inherited. Thus, it is a convenient way to start a training in a group at a specific time (now participants will participate in an ordinary way, and not make a synchronous virtual start), giving it its own name.
Wish you successful trainings!