Invitation to Treat - Law of Contract
Well this is a mere invitation through a party to another or others to make offers. Another time the offeror become offeree and invitee the offeror. Thus a positive response for an invitation to treat is an offer.
Conversely a government ministry situates an advertisement in newspapers asking to tenders for the contribute of a justified quantity of goods during a individual period of time. Thus the advert constitutes an invitation for treat and a trader's response thereto is offer that the ministry may acknowledge or reject.
Advertisement of sale through auction
However a person may do something that at the face of it so appears to be an offer. Further a condition like is the case of Harris v. Nickerson whether it was held that an advertisement regarding an intended auction that was a declaration of intention as i.e. a public manifestation about an intended act although not an offer. So thus travelling to the advertised venue does not constitute an acceptance about an offer and the traveller cannot sue the advertiser to breach of contract whether the auction is cancelled so or some of the goods to be auctioned are such withdrawn.