ALTER TABLE `event` ADD `workshop_author` VARCHAR(255) NULL, ADD `workshop_author_description` LONGTEXT NULL;
ALTER TABLE `event` ADD `workshop_banner` VARCHAR(255) NULL COMMENT 'image to be displayed as banner in the homepage';
ALTER TABLE `event` ADD `workshop_event_type` VARCHAR(20) NULL;
ALTER TABLE `event` ADD `number_of_sessions` INT(3) NOT NULL DEFAULT '0', ADD `hours_per_session` INT(3) NOT NULL DEFAULT '0';
ALTER TABLE `event` ADD `total_available_seat` INT(10) NULL, ADD `reservation_start_date` DATETIME NULL, ADD `reservation_end_date` DATETIME NULL, ADD `event_status` VARCHAR(20) NULL, ADD `back_office_status` INT(10) NULL;