I am a freshly graduated engineering student and am currently writing my first CV. At the end of my studies I attended one conference as a research paper author and another one as a guest lecturer on the same topic as the previous conference. I suppose both are important to be included in a CV, but I am not sure how to classify both as they are not the same activities (guest lecturer and paper presentation). Also, I wanted to know if I can include in advance another conference where I am presenting as a research author in approximately one month. Thank you in advance for the help.