CV, in other words the resume is the document you submit to any organization for a job application. The organization will check your CV together with your cover letter and will decide on whether you are worth to call for job interview or not.
This is why you should pay a great attention to your resume while you are preparing it in the event that you are willing to be hired by that organization. You can think about all your educational, social and volunteer experiences that you experienced or undertaken in the last four years. Tell your all experiences about each of them one by one.
Do not edit or polish your statements in your CV. Gather all the information such as title, organizations, full name of the event, department, month and year as well as location in once place when you are talking about one of your experiences. You can also add the skills you acquired through education, experience and events.
You can also consider writing your personal, technical and job skills. Tell how you can contribute to the desired position by going beyond a business presentation. Which projects you took part, what kind of results you achieved, what you have done beyond the required goals, write all of them.