If your contract does not, in fact, have an "exit" clause in it, then the FG would be in breach of the contract and you can pursue damages caused by that breach. If your contract runs for more than 2 years (which you say after that point they will no longer have events) then you may also have to be compensated for the costs of finding other locations after that 2 year period.
Where contracts are concerned, it is always best to have an attorney review the contract. Often, things such as "exit" clauses or what have you may not be clear to persons not in the legal profession. Also, the attitude of the person you describe seems to be that as a manager he has ultimate say on everything, so, you may need to hire an attorney to review the contract to see what your agreement is and then to discuss the situation with him, particularly if he has breached the contract, to see if anything can be negotiated for your benefit.
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