Last year, the events team at Pentridge Prison decided to hold a craft beer festival inside its infamous walls.

The idea struck such a chord that they ended up welcoming twice as many punters through the door than they'd initially hoped for.

As such, they're back again in 2015 with the Northern Craft Beer Festival taking over the prison on September 27.

On offer will be more than 100 beers and ciders from more than 20 of Australia’s best brewers, plus a smattering of overseas representation too. The brewers include:

Kooinda

Stone & Wood

James Squire

Little Creatures

Edge Brewing Project

Hawthorn

Three Troupers

Mornington Peninsula Brewery

Trumer Pils

Bridge Road

3 Ravens

Mash Brewing

Quiet Deeds

Bridgeport

Rocks Brewing

Yenda

Barrow Boys

KAIJU!

Hawkers Beer

Dainton Family Brewing

Cricketers Arms

Two Birds

Food is being supplied by the Woodlands Hotel and The Glass Den Café and there will be live music throughout the Sunday afternoon too.

It runs from midday to 7pm with entry costing $15, which includes entry and beer and cider samples. You can buy yours here (with an early bird price of just $10 if bought before August 31).

The festival takes place in D Division, Urquart Street (Cnr Elm Grove), Coburg.