There's a round about way in case you don't find a print shop who handles Project. You may already know this. On most computers you can take a snapshot of the screen, and paste it to PowerPoint or even Word. So, you set up the image of the schedule you want, copy the whole computer screen, paste it to Word or Power Point, crop the edges, and any Print Shop should be able to blow that up for you. On many computers you copy the screen image by holding down the CTRL button while you press the PRINT SCRN button. You're then ready to paste the image anywhere you want. Good luck.

I wouldn't use print screen, as the quality may be poor when you enlarge the image.  You can print the file to PDF, selecting the paper size you want to use (24x36, etc.).  I use CutePDF (http://www.cutepdf.com/Products/CutePDF/writer.asp), which you can choose as your printer.  Just format the sheet in Project, print using CutePDF in whatever size paper you want, then it will create a PDF that you can take to the print shop.  Hope this is helpful!