iPhone 17 Pro Max calendar search not working

There's a good chance your iPhone is still indexing all of your data for search after setting it up. Indexing is when your iPhone has to take all your data and sort it again to be able to search for things throughout the interface. This typically takes a few days, but later on you should notice more of your data showing up throughout search bars. It primarily indexes when your iPhone is connected to power, off, and connected to Wi-Fi. So be sure to do that overnight for the best results.

What do you see when you open calendar? Does the calendar show your events, holidays, etc? If so, input a P and Presidents day should come up, etc. If the calendar is blank, select one that has your info on it. On my iPhone, US Holidays (cannot be deleted) and Home calendars are selected and have my info.