An annual lights festival in a coastal town in England, the whole promenade is covered in lights.

When a lot of (often unnecessary) lights are on in a house/building someone might liken it to Blackpool illuminations.
"This house is like bloody Blackpool illuminations! Why are all the lights on?!"
by addisonand5sos August 16, 2016
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When you leave lots of lights switched on in your house and your Mum says its like blackpool illuminations. Particuarly those who come from the north of england will understand
by FerrettBalloons February 3, 2016
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