Place this line of information in one of the bottom corners of the invitation.
Typically, it is considered poor etiquette to even mention gifts on a party invitation.
A fancy Christmas cocktail party, awards presentation or quinceanera are all appropriate times to word your invitation formally.
Formal wording typically follows these rules: Wedding invitations have their own set of special rules for wording, depending on whether the wedding will be casual, semi-formal or black-tie, as well as who is hosting the event.
Writing a formal invitation letter is the proper thing to do for special occasions and events.
These rules are explained in the articles Wedding Invitation Rules, Wedding Invitation Wording and Wedding Invitation Verse.
When it comes to wording the invitation, there are a few etiquette rules to follow.
For example, guests will need to know they should bring swimwear and accessories for a pool party.
Similarly, if the party is a costume party, guests will also need to know the theme so they can dress appropriately.