Objection: The Luni-Solar advocates assume that the word mo'ed must refer to holy days. They assume that all holy days are meant when the word mo'ed is used. This ignores how the word is used in the majority of texts.
Rebuttal: No one we know believes this. There are other mo'edim that are not regulated by the moon, that are not days "set-apart" on the calendar. The word mo'ed is translated as congregation (as in "tabernacle of congregation") more than any other word, but even this is an indirect nod toward the festival and set-apart days, as Israel did not congregate at the tabernacle on common days, only on new moon days, feasts and Sabbaths.
In Scripture, the day of a child's birth is called the appointed time (mo'ed) and animals migrate at the appointed time (mo'ed). There are several places in Scripture where an agreed upon time for a meeting between two men or an event was called a mo'ed. So you see, there are a number of exceptions, not a majority as accused. These are appointed times, but not divinely appointed times to worship as the calendar events below. If a calendar mo'ed is scheduled ahead of time (i.e., new moon, feasts days, Sabbath), then it is regulated by the lights in the heavens, JUST like Genesis 1:14 says.
When the word Mo'edim is used in the context of Yah's calendar, how is it we "assume" what is meant? Genesis 1:14 says that lights in the heavens would regulate the signs, seasons (mo'edim), days and years. Psalm 104:19 says that it is the moon specifically that regulates the seasons (mo'edim). The weekly Sabbath is called a mo'edim in Leviticus 23:1-3. The annual feasts are called Mo'edim in Leviticus 23:4 and 23:37, I Chronicles 23:31, II Chronicles 2:4, et al. The Sabbath AND the annual feasts are called mo'edim in Leviticus 23:44, Numbers 15:3, 29:39, et al. Passover and Unleavened Bread is specifically called mo'edim in Exodus 23:15, Numbers 9:2-3, II Chronicles 30:22, et al. Feast of Tabernacles is specifically called a mo'edim in Hosea 12:9.