If you're in Britain you will be wanting to wave at around 10:30 PM on Friday. If you're on the west coast of the USA, you will be wanting wave at around 2:30 PM on Friday. If you're in Australia, you will be wanting wave at around 7:30 AM on Saturday.
The NASA page about the photo Cassini is going to take
The "Wave at Saturn" Facebook event page
Where to look in the sky for Saturn (US-centric)
"Wave at Saturn" banners in different languages
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