Answer:
To celebrate eating and drinking
To play futbol
To keep contact with all relatives and meet them periodically: aunts, uncles, grandfathers and grandmothers, nephews, nices, grandchildren, cousins, and so on. Also to help them or get hepl from them.
To live in parents home until get married.
To eat the main meal by noon (12 to 2.30 p.m.)
Brides usually get late to the marriage ceremony, that is why usually the invitation is one hour bfore the real hour.
Authorities always are late for meetings and celebrations. Someone has told peruvians in general (long time ago), that being late is a symbol of status...
Peruvians also have a strange beer-drinking custom. They often share one glass between the group, passing it (and the bottle of beer) from one person to the next (see related link below for more details).