In the name of Allah, the Entirely Merciful, the Especially Merciful
According to my researches, seemingly, it is better not to accept the gift of non-Muslims. Since accordance to a general rule, the gift could make you indebted to them more than it indebted them to you (as an unwritten law), then that’s why if it is said attempt not to get …
Of course it could be considered from another aspect. In truth, in case that getting the gift (bonus which is counted as a gift) could make him/her Muslim (or to provide the fields of eagerness to Islam…) or even it would prevent you (as a Muslim) from annoying, then it could be permissible and rational to accept it.
As another point you'd better to notice that accepting the bonus doesn’t show them that you agree their celebration indirectly! Anyhow, survey the points, then make an appropriate decision according to the above-mentioned points