If the WTS/FDS/GB says it, there may be a little cognitive dissonance but they will cave in. Just substitute birthday or Christmas for these flipflops:
*** g02 6/8 p. 24 Let’s Have a Hawaiian Luau ***Although the luau may originally have had some connection with false religious practices, the word has simply come to refer to a Hawaiian banquet. Many Christians may therefore conscientiously feel that they can participate.
*** g03 9/22 pp. 23-24 The Piñata—An Ancient Tradition ***
The Piñata Today
Later, the piñata became part of the festivities of the posadas during the Christmas season and continues as such to this day. (A star-shaped piñata is used to represent the star that guided the astrologers to Bethlehem.) Breaking the piñata is also considered indispensable at birthday parties. Indeed, piñatas have become so traditionally Mexican that Mexico even exports them to other countries.
We found that for many people in Mexico, the piñata has lost its religious significance and is considered by most to be just harmless fun. In fact, piñatas are used in Mexico on many festive occasions, not just for the posadas or for birthdays. And piñatas can be purchased in many forms other than the traditional star shape. They are sometimes made to resemble animals, flowers, clowns.
When considering whether to include a piñata at a social gathering, Christians should be sensitive to the consciences of others. (1 Corinthians 10:31-33) A main concern is, not what the practice meant hundreds of years ago, but how it is viewed today in your area. Understandably, opinions may vary from one place to another. Hence, it is wise to avoid turning such matters into big issues. The Bible says: "Let each one keep seeking, not his own advantage, but that of the other person."—1 Corinthians 10:24.