In year’s past, Apple has held events in March near the end of the month, and the March events have been traditionally for services like Apple News+, Apple Arcade and Apple Card. However, the March events have been times where Apple has unveiled products like the 12-inch MacBook and the original iPhone SE.
If Apple were to have an event next month, a report from iPhone-Ticker suggests that it could be on March 31, 2020, with the new iPhone SE 2 (also called the “iPhone 9”) come out on April 3, 2020.
iOS 13.4 is also expected to be unveiled and released too. The update would likely be released either on March 30 or 31. However, it would not be a surprise if it was released on April 3, which would be the release day of the new iPhone SE 2 if the rumor is true.