K.O.
Hi D.!!
Congrats on your son's wedding!
Is there a theme to the wedding or special colors? Are you looking for something simple and inexpensive or something more professional looking?
Simple & inexpensive 2 ideas - 1. you could always use a sheet of posterboard or foam core to make the sign with a sharpie marker and tie it to the car. 2. if you know a scrapbooker with a cricut machine, they could cut out letters in the wedding colors and you could use shipping, heavy duty tape to adhere them to the posterboard/foam core, so they do not fall off or get ruined in the rain. You could also print a photo of the two and put that on the sign as well. There are other ways to "decorate" the sign as well. It just depends on your theme and the look you are going after.
More professional - search on the internet for a Quick Signs place - some place like Signs Now or Signs To Go, etc. They might have something that would work great for your instance.
If you need any other brainstorming ideas, please feel free to contact me.
Good Luck!
K.