It's Eel Day In Ely - R-eel-y!
When Ely was surrounded by marshy rivers, eels were a staple diet.
They were easy to catch in the waters, and up until recent years there were plenty of them.
Now, stocks may have dwindled, and Ely may not be an island any more - but the slippery fish still has huge standing there.
Today is Eel Day, and the city will celebrate with parades, the tradition of eel-throwing (not real ones; don't panic!), and as many different ways to cook an eel you can imagine.
Heart's been speaking to Tracey Harding, who's the Town Centre manager for Ely.
She said: "I can remember my grandfather having eels on a regular basis. We've been celebrating the eel with its own National Day in the city for the last 14 years.
"Of course, Ely's name comes from the Isle of Eels, which is what it was called up to the 17th century.
"Whether it's smoked eel, jellied eel, or roasted eel, come along and try it!"
The four-day Eel Festival runs until Bank Holiday Monday.
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