I would like you to write a literature review. To me quality is more important than quantity. The literature review is based on secondary data which means you need to use different academic sources to write a literature review. These sources need to be academic such as books, journals etc. The main topic is about Event Management. So you can define what an event is and compare it with what different authors say about event. Then you can narrow it down into more details. Fo example, define what Green or sustainable Event is etc. You can then mention different topics from literature about Green event and sustainability in terms of using Alternative energy sources such hybrid electric vehicles. You can also relate that to a certain destination which is Qatar, so you can maybe find literature about how sustainable Qatar is in terms of using alternative energy sources etc.