in the case of large hall , some participants walked around trying to find a vacant seat or could not find a vacant seat within a dark hall because there was no ushers to assist them within the hall . また、会場内での誘導がないため、大きい会場では空席を探して歩き回ったり、暗い会場内で空席を見つけられなかった。
in the case of large hall , some participants walked around trying to find a vacant seat or could not find a vacant seat within a dark hall because there was no ushers to assist them within the hall . また、会場内での誘導がないため、大きい会場では空席を探して歩き回ったり、暗い会場内で空席を見つけられなかった。