Give me the time that I need to leave to make it to the symphony downtown at 8 pm .
O O O O O O O O O O O O O B-SL_DESTINATION_IN_GET_EVENT_SL_CATEGORY_EVENT I-SL_DESTINATION_IN_GET_EVENT_SL_CATEGORY_EVENT B-SL_DESTINATION_IN_GET_EVENT_SL_LOCATION B-SL_DESTINATION_IN_GET_EVENT_SL_DATE_TIME I-SL_DESTINATION_IN_GET_EVENT_SL_DATE_TIME I-SL_DESTINATION_IN_GET_EVENT_SL_DATE_TIME O