<Tr> <Th> Observed by </Th> <Td> United States, Canada </Td> </Tr> <Tr> <Th> 2019 date </Th> <Td> March 31 </Td> </Tr> <Tr> <Th> 2020 date </Th> <Td> April 5 </Td> </Tr> <Tr> <Th> Frequency </Th> <Td> annual </Td> </Tr>

Who plays the first baseball game of the season