I'm not sure that this is a reasonable thing for you to want to do.
IRL, it would be considered very rude if someone else had set up an event, and you went behind their back and re-scheduled it without consulting them.
I can understand that there are some situations where it seems like a reasonable thing to do, perhaps if the original meeting organizer has left the organisation. But even this raises all sorts of difficult questions: eg if someone declines your invitation for a different time, is the response sent to the meeting organizer, or you?
So, if it's not possible to ask the original organizer to reschedule, then I think that the professional approach is to schedule a new event, and invite the same people to it, explaining how it is different from the originally-scheduled event which is not now going ahead.
And to add "cancel any future appointments that you own" to the exit checklist for your organization.