Anything that happens, happens. Anything that, in happening, causes something else to happen, causes something else to happen. Anything that, in happening, causes itself to happen again, happens again.
It doesn’t necessarily do it in chronological order, though.
The Hitchhiker’s Guide to the Galaxy fandom is rather like the neverending party described in Life, The Universe, and Everything. The work began in the 1970s and the party is still going, attended by the descendents of the original fans.