convocation

noun
1
a large formal meeting, especially of Church officials or members of a university
مجمع, گردهمایی رسمی
2
the act of calling together a convocation
فراخوان, اجتماع, همایش
the convocation of the second Vatican Council
3
a ceremony held in a university or college when students receive their degrees
مراسم اعطای مدرک, مراسم دانش‌آموختگی, آیین فارغ‌التحصیلی
I recently attended my friend's convocation ceremony.