As a presenter, should I attend all days of conference? Recently, I have a paper accepted at an IEEE conference, and I am supposed to present my paper orally at the conference.  The programs have been released, and it is a four day conference. 
I am supposed to present at the last day. 

The question I want to ask, is that, should I also attend the first day (openning ceremony) as well?
A conference is so much more than just an arbitrary concatenation of presentations. It is a place you can meet researchers from different places who usually work in a similar field to yours. You can use the time to get to know new people, get to talk about new ideas, find out what others are currently doing in your field, and much more.

Therefore, if you have the opportunity to attend the conference more than just the day of your presentation you should.