This First Day Cover from the Caribbean island of Grenada celebrates many things:

• The stamp miniature sheet illustrations are Disney characters and there is a logo for 60 years of Mickey Mouse.
• There is also a logo for SYDPEX 88, The Sydney Australia bi-centennial National Stamp Exhibition.
• And the Australian theme is continued with the picture on the cover referencing Australian animals – Crocodile and Forest Kingfisher; and the dogs on the miniature sheet including cartoon representations of Australian cattle dog and dingo.

So you have to make your own mind up about what is commemorated. The First Day of Issue postmark is for 1 August 1988.