The Dedication of Solomon's Temple
The Dedication of Solomon's Temple is often cited as a Pinpointed Lunar Sabbath because the people rested on the 22nd of the month before Solomon sent the people away to their tents on the 23rd.
This page presents the rationale for considering it as a Pinpointed Lunar Sabbath, and discusses several objections.
After the seven days of dedication for the altar were complete on the 21st of the month, the people did not return home until the 23rd:
And in the eighth day they made a solemn assembly: for they kept the dedication of the altar seven days, and the feast seven days. And on the three and twentieth day of the seventh month he sent the people away into their tents, glad and merry in heart for the goodness that YHVH had shewed unto David, and to Solomon, and to Israel his people. (2Ch 7:9-10)
The reason that the people did not return home on the 22nd of the month was because this was the weekly Sabbath, when they held a solemn assembly (v9). This illustrates that the Sabbaths this month were on the 8th, 15th, 22nd and 29th days of the month.
It's important to understand that there are two events happening at the same time in 2Ch Chapter 7. One event is the dedication of the temple, and the other is the observance of the Feast of Tabernacles.
After the events related to the temple dedication are described in verses 1-7, the "feast" that was observed at the same time is described in verse eight:
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. (2Ch 7:8)
This says that Solomon, and all Israel, "also at the same time" that the temple was being dedicated, kept "the feast" for seven days. The Feast of Tabernacles is a seven day feast in the seventh month with a solemn assembly on the 22nd of the month:
Speak unto the children of Israel, saying, The fifteenth day of this seventh month shall be the feast of tabernacles for seven days unto YHVH. On the first day shall be an holy convocation: ye shall do no servile work therein. Seven days ye shall offer an offering made by fire unto YHVH: on the eighth day shall be an holy convocation unto you; and ye shall offer an offering made by fire unto YHVH: it is a solemn assembly; and ye shall do no servile work therein. (Lev 23:34-36)
So we see that, at the same time that the altar was being dedicated, Solomon and all Israel kept the Feast of Tabernacles from the fifteenth of the month until the twenty-first, and then observed the Eighth Day as a solemn assembly on the twenty-second of the month.
It's also evident from looking at the Hebrew in verse 9 that it is not describing the weekly Sabbath. The Hebrew word in v9 translated as "solemn assembly" is atsereth (עֲצֶרֶת), Strong's Number H6116. This word is always used to describe a festival or holiday, but is never used to describe the assembly held on the weekly Sabbath. Instead, the holy "convocation" to be held on each weekly Sabbath is a mikraw (מִקְרָא), Strong's Number H4744. A mikraw is an "assembly" or "meeting" as opposed to a festival or holiday. This makes it clear that the "solemn assembly" being observed here on the 22nd day of the month was indeed the eighth day of the Feast of Tabernacles described in Lev 23:36.