Ralph held numerous assemblies but I am assuming that your are referring to the one he called in chapter 5: Beast from Water. Ralph wanted to set some things straight, rules relating to using the rocks near the sea as a toilet, keeping smoke showing as a signal and having only one fire lit and this he managed to do. However Ralph's prime purpose was to end once and for all any talk of the existence of a beast. In this he failed because at the end of the meeting there was an overwhelming vote in favour of belief in ghosts. Rationality had lost to superstition.
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Piggy
He asks him to sharpen it at both ends with intent of putting one end in the ground and the other end to have Ralphs head on it. This is not explicitly stated in the novel but we know this because of the lord of the flies
Malph.
the clean up the islland
he is homesick, and stressed