Fathersday - how would a western disciple of the Buddha make use of this fest?

How and why would a "modern" or "western" follower of the Buddhas teaching celebrate this day, and use it to pay gratitude to his father as one of his/here first God and the other three Gods? Maybe you like to share also how you fullfill this duty personaly to give others inspirations and ideas, meaning: Be not greedy in sharing possible merits you do or have done. *(Note: This question is given as a gift of Dhamma and not meant for commercial purpose or other wordily gains)*