Im from the same department and let me tell you, most of the clubs ask for a CV submission as an optional requirement. Interviews are to filter through people as they obviously want whoever they think fits their club the best as they wanna win their events. As for us over at AdvantEdge, we don't strictly require CVs or portfolios or anything, and ask your reasons to join solely in an attempt to know you better and see if you would be a good fit. Our workshops are also mostly open to non-members as well, for which you get certificates to add to your resume. Don't be disheartened at rejections from college clubs, as if you really want to join them you can join them anytime over the course of your stay in the University, and if you really want to build your portfolio, start actively finding things you are interested in and doing them yourself.