It seems this is the way they traditionally like to enjoy their food together. The food is presented on some banana leaves and you eat with your hands. No plates, no cutlery.
The official name for such a festivity is "Boodle fight". It is copied from the American army. This is what google says:
Boodle fight is a military style of eating where long tables are prepared and food are on top of the table. Viands and rice ready to eat using your bare hands, jugs of water are prepared on the side to wash hands before the "eating combat".
So enjoy the pictures, there is not more to say.