Distinguish the coming (next) event and the events that are not yet being worked on #380
Description
In the sprint page https://sciwork.dev/sprint/ we list the events that have a time to help the community to schedule their time.
But it is not clear what is the event that is happening immediately, and what are the events that have not been in progress.
The presentation of the list may be improved, while it is also about the organization workflow.