Ask a Stupid Question Day is celebrated on September 28, 2017. Ask a Stupid Question Day is a holiday that is sometimes celebrated in the United States, usually by school students and teachers. Although Ask a Stupid Question Day's default date is September 28, in practice it is usually observed on the last school day of September.
This holiday was created by teachers in the 1980s to encourage students to ask more questions in the classroom. According to HolidayInsights.com, "[a]t the time, there was a movement by teachers to try to get kids to ask more questions in the classroom. Kids sometimes hold back, fearing their question is stupid, and asking it will result in ridicule." (With material from: Wikipedia)