February 5th, 2019 is the Lunar New Year. Children all across Asia are given pocket money nestled in bright red envelopes. Started in the Han Dynasty, coins (objects that looked like coins) were tied together with red string and given to ward off evil spirits. Eventually the red string became red envelopes. More about the history on the red envelopes.
Why not make your own red envelopes with your host children?
Source: https://www.littlepassports.com