Community Service Day
Community service days are very popular in the US corporate culture. Often, employees are even getting paid for working for a local NGO that cooks food for the homeless, etc.
Transferred working day
In the Soviet Union, modern Russia, and Hungary the Friday following a public holiday that falls on Thursday and the Monday before one that falls on Tuesday are transferred to Saturdays to make longer runs of consecutive nonworking days. In this case the "Bridge" Monday or Friday is treated as a Saturday in terms of time tables and working hours and the related "Working Saturday" is treated as a normal work day. Over the two work weeks concerned, work is done on 9 days with one work week running for 6 days and the other one for 3. Employees always have the option of taking a day from their personal vacation allowance and using it to avoid working on the "Working Saturday".
For example, in 1997, in Russia April 28, June 9, and December 29 are working Saturdays in lieu of April 30, June 11, and December 31, respectively.
This practice requires work on Saturday which is forbidden in Jewish law (Shabbat). For this reason, Jews are sometimes offered the alternative of taking the "Working Saturday" off as an unpaid day. In reality the working Saturday is a day of low productivity due to a tired and resentful workforce. Thus it is often used for corporate team building activities and people often go home in the mid afternoon.
In Poland, there was six-day workweek till the 1970s. In 1972, the communist government started a long-term process of switching to five-days workweek. It started with one Vacant Saturday per month and citizens were promised to be given more. The delays in introducing more Vacant Saturdays were one of many sources of 1980 unrest in Poland leading to creation of Solidarity movement.
After the fall of communist regime in 1989 there was still one Working Saturday per month accompanied by roughly three Vacant Saturdays. It wasn't until the late 1990s, when a 5-day workweek was finally declared.