Bike or take the Commuter train/Commuter rail/Pendeltåg ( https://api.sl.se/fordonspositioner#PT ) with your bike to
Stockholm Södra exit Rosenlundsgatan in front of ICA Supermarket Södra station
Bring a Mug, a bike and some fluid for the drink stops.
A-B Stockholm Södra-Huddinge (Stockholm södra-Årstaberg-Älvsjö-Stuvsta-Huddinge)
Be there or run Stockholm Marathon starting at 11:00/11:10 : https://www.stockholmmarathon.se
On On/Sprinto
On In!