While management enjoy the facilities at the hotel, union representatives and staff will be meeting to decide whether to ballot for a strike or industrial action over the pay rise.
An indicative ballot of Unison members unanimously rejected the pay rise in late March.
But the trust has said in an internal memo that it will implement the 2% pay rise at the end of this month regardless of the ballot.
Staff were given the option of signing an opt-out form if they did not want to accept the pay rise.
The memo added that the hospital could not afford to make a pay rise above 2% because it had to maintain buildings and equipment.
According to latest board papers, the trust is due to make a surplus of £6.7m this financial year.
Unison branch secretary Dean Jones said: ‘They have not consulted - to say that they can’t afford any more then spend £20,000 on a jolly so that everybody can bond is a kick in the teeth for the staff who have made that profit for them.’
Chief executive John Gilham said: ‘A number of senior doctors, senior nurses, other senior health professional staff and senior managers will be spending time away doing some intensive work on our detailed plans for Southend University Hospital over the next three years.’