When you give a presentation the week before the weekend during which the time will change to wintertime, you can use this to your advantage. The change from summer time to winter time will imply one extra hour of weekend as the clock is put back one hour.
You can use this to tell your audience that you have a present for them, namely one extra hour of weekend.
Explain that they simply need to turn back their clocks one hour during the weekend. It is a funny small gesture that you can use in your presentation the week before the change to winter time. Give some time to your audience.