Is it permissible to attend a wedding in a church and enter it, with the possibility of shaking hands with non-mahram individuals, with the intention of inviting them to the religion?

It is forbidden to accept an invitation that includes evil acts such as immodest display, mixing of sexes, and drinking alcohol, whether the invitation is from a Muslim or a non-believer. However, if the invitation is free of evil acts, there is no impediment to accepting it, even if it is in a church, provided that the purpose is to win hearts and invite people to Islam. One must be cautious of the influence of such schools on the daughter's عقيدة (creed/faith) and behavior.