A loooooooooooong time ago, in a previous version of this website, when you were organizing an activity, you could preview it before posting it. Now it is the other way round : you write the text, send invitations to you friend's network, and press «finish and view». i.e. you see it once it's already online and invitations are already sent. Not a problem for a reasonably capable person, but for an empty head like me, it is, especially when combined the «duplicate activity» feature.
Here is what happened to me twice : I duplicate an activity, scheduling on a Friday without seeing that the original took place on a Thursday and that the text mentions it. I notice it when seeing it online (or later, when a charitable and puzzled friend writes to ask which is the right day, the one on which the activity is posted or the one indicated in the text). So I have to write to the 170 or so persons in my network to tell them about the mistake.
So why not allowing to preview your activity before posting it, as the good old days ?