mingle in (with someone)
to join in with someone; to mix with people. I am going to go into the hall and mingle in with the rest of the guests. Ken came into the room and mingled in at once.
mingle (someone) with (someone else)
and mingle (something) with (something else)to mix people together; to mix things together. Try to mingle your friends with mine. You had better not mingle your money with that of the corporation.
mingle with someone
to mix with people. Try to mingle with the guests. I would like to get out and mingle with people more.