The Concerto Group, supported by several suppliers, acquired some of the venue's assets and attempted to save a number of outstanding bookings after Fortesqueue's entered administration on 21 October.
Two of the bookings, including a Remark charity event for 1,400 guests, will go ahead but five others have not been saved.
Concerto director Sam Gill said: "Despite a superb effort by fellow creditors to try and deliver this project, I am afraid the numbers just did not add up and sadly we are having to let the venue go.
"Creditors including ourselves, De Boer, Robert Lawrence Productions, Coin St, Fluid, Acclimatise and Igloos were all prepared to keep the show on the road at minimal cost to ensure that clients weren't let down but, in the end, the gap was still too large to bridge.
"Our focus has now turned to finding new venues for the remaining clients whose events have been made homeless by the venue's demise."