I'm planning to attend a prestigious conference in computer science. The registration fees are very high (~150$ per day). I'm presenting as well, but on a co-located event directly after the main conference.
I don't know whether my university will fund my registration fee for the whole conference. They will most certainly fund the fee for the little event where I'm presenting. In case they don't fund the whole conference, is it acceptable to show up to the conference without being registered? (Of course, I wouldn't have the conference meals with the other participants on the days I'm not registered.)