Scottish court will hear this Friday (4th) and rule next Monday (7th) if it can send the extension request if Johnson refuses.
Parliament will be prorogued from Tuesday 8th for one week.
Thurs 17th - EU summit.
Sat 19th - Letter asking for an extension
Mon 21st --- Sometime this week parliament votes for an election
- - - -
Nov 28th - Polling day
After that parliament dissolves for a general election. The shortest session of parliament ever. One week.