13 A very large crowd of people assembled in Jerusalem to celebrate the Festival of Unleavened Bread in the second month.

Read 2 Chronicles 30:13 Using Other Translations

And there assembled at Jerusalem much people to keep the feast of unleavened bread in the second month, a very great congregation.
And many people came together in Jerusalem to keep the Feast of Unleavened Bread in the second month, a very great assembly.
So a huge crowd assembled at Jerusalem in midspring to celebrate the Festival of Unleavened Bread.