It will make them easier to find as the group grows.
Other tags you may want to use: "art deco" artdeco napier weekend cars vintage clothing 1920s 1930s
Also helpful can be to tag with names and makes of cars, if you know them. Or descriptions of what's in the photo eg "bathing belles", "hawke's bay club" "lady in red", etc. Anything that will make it easier for someone to find our beautiful pictures of Napier's special celebration.