in aid of
Support or helping (someone or something). The fundraiser is in aid of the local family whose house just burned down.
in aid of
in support of; for the purpose of raising money for. chiefly British 1999 Teesdale Mercury A wine and savoury evening in aid of cancer research will be held…on Friday.
in aid of somebody/something
(British English) in order to help somebody/something: The children spent the day collecting money in aid of charity.