What about an intro like this.
Islam, derived from the Arabic word "peace", is the second largest religion in the world with over 1.5 billion adherents. According to the CIA factbook, Islam is also one of the fastest growing religions. However, it is also the most understood! Islamaphobics around the world have, unfortunately, given the public a poor perception of a great religion. If you wish to learnt he truth about Islam, come to the Islamic conference at <insert date here> and you could be in for a huge surprise!
this is a very good beginning, people like facts and start to think about it.
alhamdullilah that you have a day like that on your university, good luck!!!