
die Einberufung
call-up
The official request for a person to begin military service or civilian service.
Er erhielt den Bescheid für seine Einberufung zur Bundeswehr.
He received the notice for his call-up to the German armed forces.
call-up / convening
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call-up
The official request for a person to begin military service or civilian service.
Er erhielt den Bescheid für seine Einberufung zur Bundeswehr.
He received the notice for his call-up to the German armed forces.

convening
The formal calling together of a meeting, body, or committee.
Die Einberufung einer außerordentlichen Hauptversammlung wurde von den Aktionären gefordert.
The convening of an extraordinary general meeting was demanded by the shareholders.
'Einberufung' (call-up / convening) is the nominalization of the separable verb 'einberufen' (to call up / to convene). The verb consists of 'ein-' and 'berufen' (to call/appoint someone) and means to 'call' someone into a group or into service.
Die Firma kann eine Sondersitzung einberufen, wenn es nötig ist.
The company can convene a special meeting if necessary.
You can recognize the meaning from the context: If it is about the military, compulsory military service, or civilian service, it means the request to report for duty. If it is about bodies, meetings, or assemblies, it means the formal calling together.
Die Einberufung zum Wehrdienst kam für ihn überraschend.
The call-up for military service came as a surprise to him.
In a military context, one receives an 'Einberufungsbefehl' (call-up order) or 'Einberufungsbescheid' (call-up notice). The request itself is the 'Einberufung zum Wehrdienst' (call-up for military service).
Mit dem Einberufungsbefehl musste er sich bei der Kaserne melden.
With the call-up order, he had to report to the barracks.
When a meeting is convened, the body often appears in the genitive or with the preposition 'von' (of). Typical verbs are 'fordern' (to demand), 'beschließen' (to decide), or 'beantragen' (to request/apply for).
Der Vorstand beschloss die Einberufung der Mitgliederversammlung.
The board decided on the convening of the members' meeting.
invitation
Both an Einladung and an Einberufung can get members to attend a meeting. An Einladung is a request to the individual people to participate; an Einberufung refers to the formal calling together of the body. Use „Einladung“ for an ordinary request to attend, and „Einberufung“ for the official process.

Die Einberufung des Ausschusses zur Sitzung am Montag wurde offiziell bekannt gegeben.
The convening of the committee for Monday’s meeting was officially announced.
Die Mitglieder erhielten eine Einladung zur Sitzung am Montag.
The members received an invitation to Monday’s meeting.