Agree that this is NOT resolved. I leave iCal open all day long. I am syncing multiple devices, just as I did before I upgraded to Lion. It was all working fine. This problem occurs regardless of whether I invite someone else or not. I am not "sending" the events to my other devices. I sync them, so I don't have to do that...supposedly...
My "Best Practice" advice for coping with this bug issue until it IS resolved is to:
1. create the event (however you wish - because doing it differently doesn't seem to reliably eliminate the issue)
2. open the event immediately
3. copy the event name and paste it into the note field and close the event (BTW, isn't it odd that there is only a Delete option at the bottom of the event panel and not a Save option as well?)
By doing this, I have been able to re-open the items that reverted to "New Event" and determine their original purpose. Then, copy the note (original name of the event) and paste it back in to the Event Name field...
Boring, waste of time, but... a work around.
BTW, having had a long experience with MS bugdom, my observation is that a team was hired from MS and is now on the iCal project. Or perhaps, CQE (Continual Quality Erosion...)