Message feature in CB GroupJive

I understand that the feature Message (PMS or eMail) in CB GroupJive and CB GroupJive Events allows to create and sent message within the group to attending guests. Correct ?

I do not catch the  meaning of [Guests] displayed at a Group level because I understood that Invite was assigned to each event. If invitation are at group level, what is the difference between Attending Guests and Paricipants ( those who joined the group). How do i manage attendance within each event ?

Side question: I have editor TinyMCE available for PMS but not for eMail. Is it possible to have editor in the eMail ?

I understand that the feature Message (PMS or eMail) in CB GroupJive and CB GroupJive Events allows to create and sent message within the group to attending guests. Correct ?

Correct.

I do not catch the meaning of [Guests] displayed at a Group level because I understood that Invite was assigned to each event. If invitation are at group level, what is the difference between Attending Guests and Paricipants ( those who joined the group). How do i manage attendance within each event ?

Not sure I understand what you're asking. Group members are not required to attend an event. So an event can have 3 people attending while the group itself has 10 members.

Side question: I have editor TinyMCE available for PMS but not for eMail. Is it possible to have editor in the eMail ?

Yes, edit the CB GroupJive Events plugin then under Parameters > Message enable HTML.