Lets say we accept the idea that Mother's Day, Father's Day and birthdays are acts of worshipping humans. No Bible basis whatsoever, (the Bible even tells us specifically to 'honor thy father and thy mother) but lets say we accept it anyway. Now, if you accept that logic, then the logical next step would be to say that graduations, baby and wedding showers, wedding receptions and wedding anniversaries are worshipping humans. But very few JWs see those celebrations as worship. That makes no sense. Those celebrations are still focusing attention on a person.
I should know by now not to look for logic when it comes to JWs!