The 'Mandara Hotel Conference Hall Case' likely refers to a specific case study or event related to the Mandara Hotel's conference hall. This could involve aspects such as design, management, or an event held there. However, without more context, it is difficult to provide specific information. If it is a well-known case study, it would be related to hospitality management, event planning, or architectural design. If it is a specific incident, details would be needed to understand the nature of the case.