Or HaChaim on Numbers 25:2/אור החיים על במדבר כ״ה:ב׳

1ותקראן לעם, They called to the people. The reason the Torah had to repeat the word לעם having previously described the people involved as העם is that not all of these people went for strolls so that they encountered the Moabite women. Our verse indicates that the Moabite women went out to seek out Israelites who had not gone strolling in the neighbourhood around their camp. An alternative explanation could be that they wanted to involve the Israelites in a group activity thus breaking down each Israelite's inhibition against committing sinful acts. They were invited to partake of the meals prepared by the Moabite women in honour of their idols.

2לזבחי אלוהיהם, to the sacrifices of their gods. Although the Midrash had described the worship of the Baal Pe-Or as consisting of the worshiper excreting and urinating in front of that deity so that slaughtering of meat was certainly not part of this, it is possible that the meat was not really part of the rite but was part of a celebration in their god's honour. On the other hand, eating a lot may have been intended to ultimately result in excreting a lot in front of that idol.

3ויצמד ישראל לבעל פעור "and Israel was joined to Baal Pe-Or." The words ויצמד ישראל לבעל פעור "Israel joined itself to Baal Pe-Or mean that the reason for Israel bowing down to the idol was the peculiar power of this idol exerted over people who worshiped it. [apparently even the elite was now involved. Ed.]