All the deets appear to have been put last minute in the Google Doc that skaters can use to enter:
Amsterdam Roller Derby invites you to join our Summer Jam Scrimmage!
When: 3 July 2022, 10:00-13:00 + Afterparty!
Where: Sportshal de Weeren
Schedule:
Hall opens: 10:00
Scrimmage start: 11:00
Scrimmage end: 12:25
Afterparty details to be shared at later date.
Details:
Spectators are welcome, bring your friends to cheer you on!
Suggested donation: 5 euros (fully voluntary)
Keep an eye on the Amsterdam Roller Derby Facebook timeline for updates.