Should come.. at Jerusalem] This implies an endeavour to centralise the national worship by the abolition of the local sanctuaries (as described in 2 Kings 18:4).
Related Commentaries of 2 Chronicles 30:1
2 Chronicles 30:1
1 And Hezekiah sent to all Israel and Judah, and wrote letters also to Ephraim and Manasseh, that they should come to the house of the LORD at Jerusalem, to keep the passover unto the LORD God of Israel.