Oscar: a person in a limo with a number of appointments arranged by the “Office”. Appointments which are extremely different between them. Oscar changes faces, clothing, attitude, posture, everything. Oscar becomes totally different every time to accommodate the needs of its next role.
He must be a banker, a beggar, a dancer using a motion capture uniform, a repulsive inhuman grotesque figure, a father, a musician, etc. Time is always against him. He must fulfill all these appointments within a day. A feast driven by his desire to “disguise” himself.
Does it ring a bell? Holy Motors is an allegory :). My interpretation follows … My suggestion: read it after you’ve seen the film.