Simplest thing would probably be to get people to send you dropbox links, so you can download their video clips to your PC, then chuck them all on a USB stick.
That list of file types is pretty comprehensive so hopefully will accept all the youtube vids, i think they are normally mp4
I doubt you would want to show it, but i uploaded a short clip to dropbox for Stevo a few weeks ago, maybe you can test it with that, you should be able to directly download it but may need to make an account?: https://www.dropbox.com/s/7o00el3fk2vqvl5/Simms%20climb.mp4?dl=0
Have you tried running video files on the TV via the USB connection? I tried this a couple of years ago and found the playback to be very flakey - lots of stop / start / thinking about it.
You wouldn't want this on the day.
If you've tested USB playback and it works, use a freeby program like YTD (YouTube Video Downloader http://www.ytddownloader.com/) to download the vids you like best onto a USB stick and you're away.
Have you tried running video files on the TV via the USB connection? I tried this a couple of years ago and found the playback to be very flakey - lots of stop / start / thinking about it.
You wouldn't want this on the day.
If you've tested USB playback and it works, use a freeby program like YTD (YouTube Video Downloader http://www.ytddownloader.com/) to download the vids you like best onto a USB stick and you're away.