No, that's Paul's opinion on those who worshipped Saturday as per Jewish custom and Sunday, which is what a lot of the earliest Jewish Christians seem to have done. It has nothing to do with sanctioning the non-worship of God cause it would cost the church involved too much money or because they thought it to be more fun to stay home and play Christmas.
Sunday. The Lord's Day. Ask John:
9: I John, your brother, who share with you in Jesus the tribulation and the kingdom and the patient endurance, was on the island called Patmos on account of the word of God and the testimony of Jesus.
10: I was in the Spirit on the Lord's day, and I heard behind me a loud voice like a trumpet
11: saying, "Write what you see in a book and send it to the seven churches, to Ephesus and to Smyrna and to Per'gamum and to Thyati'ra and to Sardis and to Philadelphia and to La-odice'a.
It might be wise for the leaders of such churches to reread what the Lord said to the seven churches....
So you need to be in an "approved building" to "get in the Spirit on the Lord's day"?