'. The main subject here is 'a series', which is singular, the verb should be 'singular'.
to be arranged.
A body of, A crowd of, A bunch of, A team of, A heap of, A herd of, A fleet of, A piece of, A pair of, A chain of |
Singular.
e.g.
of people is waiting for the actor.
Subject (Singular) -----> Verb (Singular) |