You are not allowed to solve this puzzle without attending a short talk

My friends and I are to be given a short talk about providing the solution to this puzzle. You are not allowed to solve the puzzle without attending the talk.

B
C
H
L
M
P
W

Question

What is the talk about?

Last of all, can you identify me? – My word! I am the odd one out by the sound of it.

Hints

1. Don’t worry, the talk is informal as well as short. My friends and I don’t need to receive some form of lecture for example – let alone confused conversation.

2. There are three main clues:

(a)

(b)

(c)

EDIT – In order to avoid ambiguity, I edited to replace some pronouns with the nouns they were referring to.