Wikia

The following events occurred on October 25.

1985, Friday

About 8:23 AM - Marty McFly enters Doc's garage and turns on the CRM-114 amplifier.
Due to a slight overload, he destroys the amplifier.
Doc Brown calls and tells him to meet him at Twin Pines Mall at 1 AM, Saturday.
Doc's clocks all chime at 8:25 AM.
Marty rushes to Hill Valley High School and is tardy.
Marty and his band The Pinheads audition for the Battle of the Bands.
Marty gets Jennifer Parker's grandmother's number and plans to go up to the lake.
Marty arrives home and sees the car wrecked by Biff Tannen
George McFly watches The Honeymooners episode "The Man From Space".
Lorraine announces that "Jailbird" Joey Baines failed to make parole again.

Biff Tannen enters this time period from 1955 after stealing a new DeLorean time machine from IFT volunteers there attempting to fix the past.