Christmas and Romans 14:5-6

Some believers think that Romans 14:5-6 warrants them holding special events to celebrate Christmas.1 I wish to probe this claim.
Since I have already looked at Romans 14 and 15 in the round2 – and it is vital to see the big picture in context – I now limit myself to quoting the two verses in question:
One person esteems one day as better than another, while another esteems all days alike. Each one should be fully convinced in his own mind. The one who observes the day, observes it in honour of the Lord. The one who eats, eats in honour of the Lord, since he gives thanks to God, while the one who abstains, abstains in honour of the Lord and gives thanks to God (Rom. 14:5-6).