A male may say at a commencement of a first class to graduate.
A liberalization of a sector of a (petroleum industry) may undergo a commencement.
A proscription can be prior to a commencement of negotiations.
A country may welcome a commencement of a process of dialogue.
A US-president may say in a (commencement address) to a school.
A resolution may call for a commencement of (impeachment proceedings).