is festivals and celebrations

uphold

keep up

the age-old

very old

event marks

festival marks

festive season

usually refers to the time around Christmas and New Year

movable feasts

can refer to any arrangement, plan or appointment where the date is flexible

long-standing

which has existed for a long time

get hitched

get married

tie the knot

get married

join in matrimony

marry

propose a toast

make a toast

wedded bliss

hqppiness through being married