conference, congress, convention
congressional, government, party, union
Democratic, Republican

choose, elect, select
send
They decided not to send a delegate to the conference.

attend (sth)
No fewer than 2 000 delegates attended the conference.

approve, vote (on sth)
The delegates voted to support the resolution.

vote for sb/sth

delegate from
a delegate from the local party

delegate to
the British delegate to the United Nations

Delegate is used with these nouns as the object:
authority, power, responsibility, task