Cous Cous is extremely easy to do when catering in bulk - I've done it in kitchens for lots of peeps (or indeed just one or two - I use it all the time when camping).
Just buy a couple of bags of the stuff (depending how many you plan to feed) - shove it in a big pot with a veggie stock cube or two and a good dollop of olive oil.
Then *just cover* with boiling water. Leave it *off* the heat. It'll swell by itself. Easy peasy. A little bit of lemon juice and a couple cans of chickpeas are quite nice to add too.

Not the proper steaming way - but great for easy outdoors feeding.