How can one honor a deceased parent to a greater and more significant extent, and is holding a dinner party for friends and relatives with the intention of doing something the parent used to love considered part of honoring them?

Filial piety does not cease with the death of one's parents. It includes supplicating for them and seeking forgiveness for them, fulfilling their pledges and wills, maintaining ties of kinship related to them, and honoring their friends. Among the best charities on their behalf is providing water, such as digging a well. Feeding their friends and relatives is considered an act of kindness towards them.