Most people will have used Google as a search engine at one time or another, and you may have occasionally noticed the logo being changed for a particular date or festival. Below is a collection of several logos used over the years, some were only used for users from particular countries, so not everyone will have seen them.
One of the earliest, released on 26th November 1998, was in celebration of Thanksgiving in the US:
The first non US logo was in France, for Bastille Day on 14th July 2000:
As the internet became more global, more countries saw important dates celebrated:
Google also celebrated many globally important dates too, with Olympics often inspiring a number of logo designs, as below:
Other International events and celebrations which were celebrated globally: