Research from Best Parties Ever has revealed that a third of employees expect a spend of over £50 per head.
The member's bar at 66 Portland Place can hold up to 70 guests for private events.
Agency based in North Wales reports strong year including opening its third office in Manchester.
The new 92-room property has a roof terrace, all-day restaurant, underground speakeasy and will open in February 2019.
Natalie Allen joins London-based agency to manage and develop some of its key clients, such as Domino's and Prudential.
Business travellers from Taiwan, USA and Germany book the furthest in advance, says travel giant.
Registrations will remain open until 18 January with all events partnerships announced by the first week of February.
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