How many years was the Indy 500 ran on may 30TH?

The Indianapolis 500 has traditionally been held on Memorial Day weekend, which is the last weekend of May. It was first run on May 30, 1911, and continued on that date until 1970. After that, the race was often moved to the Sunday of Memorial Day weekend, which can fall on different dates. However, the race has still been frequently held on May 30, particularly in earlier years, making it a significant date in the event's history.