I'd call it a disco and games party and make it 1.5 hours rather than 2 hours.
1 hour = music on and have a big pot of sweeties to give to the children as they play musical statues/sleeping rabbits/pass parcel other (just look up music games)
Set up a table with colouring books and pens
Another table with some water transfer tattoos
At the end of the hour feed children, do cake and the end of them eating, small party bags to signal home time
If you don't have an entertainer/bouncy castle then having another half hour of games/music after they eat you will probably be totally run out of ideas and they'll be restless
If you're short on money for party bags then do the cake just before they start eating rather than at the end - then cut the cake up in slices for the bag and have some pre blown up balloons ready, if you hand them all a balloon and bag with cake in they'll be happy enough
And in terms of feeding them - again if short on money you can save on waste by bringing a few jugs for squash, paper cups - then just do bags/packets of food and take the leftovers home (crisps, mini biscuits, raisins etc) couple of packs of sausage rolls/cocktail sausages in some pots spread round the tables as well as packs of stuff and you'll be set