Unemployment compensation benefits, extended duration benefits, and federal-state extended benefits shall not be payable to any individual on the basis of any services, substantially all of which consist of participating in sports or athletic events or training or preparing to so participate, for any week which commences during the period between two successive sport seasons, or similar periods, if such individual performed such services in the first of such seasons, or similar periods, and there is a reasonable assurance that such individual will perform such services in the later of such seasons, or similar periods.