I created a slideshow for my rehearsal dinner and now I need to figure out a way to show it... we will be in a rather large room and they only have a screen, no other equipment. I appreciate any suggestions!
You need a display projector and you could connect a laptop to it if you have one.
You don't mention what type of slide show it is. Is it created in Vegas MS as a .AVI file? In that case you can play the file on the laptop with good quality.
If you don't have a laptop, you could perhaps create a DVD and play in a DVD player. (Make sure that you have tested the DVD disk in the player you are going to use.)