Is it permissible to participate in the celebrations of non-Muslims in order to attract them to participate in the celebrations of Muslims?

It is not permissible to participate with disbelievers and polytheists in their innovated festivals, as this entails aiding in sin and transgression, and imitating them, and the Lawgiver has forbidden imitating them. However, if the participation is in a banquet that does not involve any Shariah-prohibited matters, and does not lead to loving theievers, then there is no harm in accepting their invitation while striving to convey the religion of Islam to them.