Photo files are still in Lightroom, but I accidentally deleted and emptied the Trash with the original photo files. So now, as I try to export the photos, it is saying photos are offline or missing. I cannot recover the original file location because the trash was emptied. How can I still export the photos in Lightroom, it's a wedding that I HAVE to be able to export?!
If the file is deleted, you restore it from your camera card; or
If the file is deleted, you restore the photo from your backups.
If you have no backups, well I can't understand why anyone would not have backups of important photos. You might want to consider developing a strategy where all your files are backed up as soon as possible after the photos are copied from camera card to computer.
You can recover the previews from Lightroom, but these are usually small size and lower-quality versions of your photos, probably not suitable for printing. Use this plug-in to recover the previews: robcole.com - PreviewExporter
You might also try recovering the deleted files from your computer's hard disk and/or camera card, using something known as an "undelete utility", one of which is Recuva - Undelete, Unerase, File and Disk Recovery - Free Download
By the way, your photos are never stored in Lightroom, they are/were stored on your hard disk.