Conversation so far:
When did the formation begin?
On 20 July 1976, childhood friends Sumner and Hook separately attended a Sex Pistols show at the Manchester Lesser Free Trade Hall.
How did that turn out?
The following day Hook borrowed PS35 from his mother to buy a bass guitar.

Question: What happened later on with the formation?
Self-contained rewrite: What happened later on with the formation of Joy Division after the Sex Pistols show on 20 July 1976?