According to the author of 2 Chronicles, Solomon celebrated a big party for seven days, and lots of people from all over Israel came to join in. It was a special time when everyone came together to have fun and be happy.
2 Chronicles 7:8: Also at the same time Solomon kept the feast seven days, and all Israel with him, a very great congregation, from the entering in of Hamath unto the river of Egypt.
States Solomon held a feast that lasted fourteen days.
1 Kings 8:65: And at that time Solomon held a feast, and all Israel with him, a great congregation, from the entering in of Hamath unto the river of Egypt, before the LORD our God, seven days and seven days, [even] fourteen days.