It was a joke. People still changed plans.
A parody account posts a fake cancellation. Some readers recognize the joke. Two volunteers do not and cancel their rides.
Onda asks
Who changed their plans, even if the account intended a joke?
Try one response
That dismisses what happened and leaves the practical confusion unresolved.
Try another response
You correct the confusion and help people decide what to do now.
Make something useful
Write a reply with the event’s status, source and contact.
Tell a friend
That came from a parody account. Here is the organizer’s real update so you can decide what to do now.
Say it your way. Keep the supported meaning and the part you still need to check.