Seeing as you have only a day left you can start by telling people such as the lecturer you stutter. Hiding your stutter makes it worse. University students are generally much more mature than students still in school. After the speech it is time to work on your speech. Try traditional therapy or the Mcquire Program. Personally I use the Mcquire Program although I also use some techniques from traditional therapht. When you deliver the speech stand proud and tall. Good luck.