My daughter and son in law (both claim to be devout JWs) go to his parents house on December 25th and eat a nice fancy dinner and they all have presents for one another wrapped in winter themed (not Xmas) gift wrap. They also get together on Thanksgiving for an elaborate dinner (not celebrating at all, you see).
One poster on Facebook Ex JW Recovery Group said this was celebrating "fractions" of Xmas so it was OK. I loved that idea!!!