This is a day to re-open businesses. The following is a passage about the fith day of the Lunar New Year from Wikipedia:
"Fifth dayIn northern China, people eat
jiǎo zi (
simplified Chinese:
饺子;
traditional Chinese:
餃子), or dumplings on the morning of
Po Wu (
破五). This is also the birthday of the Chinese god of wealth. In
Taiwan, businesses traditionally re-open on the next day (the sixth day), accompanied by firecrackers.
It is also common in China that on the 5th day people will shoot off firecrackers in the attempt to get Guan Yu's attention, thus ensuring his favor and good fortune for the new year."