Well, those who are interested could agree a day and time when we would all try to be online and actively posting in a new thread generated especially for the party.
So the thread could get lots of posts during the time that the party is running.
We could plan the party in this thread. For, er ... practical reasons, people would each need to supply their own food and drink.
Though suggestions on what that could be could be discussed in this planning thread.
One or more Serif products could be used to produce some invitations and uploaded to this thread.
There could be music and videos. Maybe people here who make videos would like to post a video they have made during the party.
We could try to devise some sort of rule that if a video is posted then no other video is posted by anyone until the posted video run time plus 2 minutes has passed. Together with a rule of maximum runtime for a posted video.
That way, the party would be real time as people could put the video on, even if just in the background while other posts are being made and read. So like a party in real time.
Some people could post jokes.
I think that if people want to make it work then it can work and people enjoy themselves.
William