If you ask me this is a really bad idea. What happens after this event and nothing happens. Some people will say it wasnt time yet, but others will begin to have doubts.
I remember a poster posting about the Siyum in 2005, their Rebbe told them what an amazing event it was going to be and to practice Yeha Shmay Rabba and all the Bochrim practiced it will all the kavana they could and for sure Moshiach would come. Of course he didnt and he began to have doubts and went OTD for a while.
You have to be real careful with such an event.