The Sky Sports-televised major sees the biggest stars from both the PDC and BDO systems competing in a group and knockout stage format across nine days from November 11-19.
BSO world champion Glen Durrant, Lakeside runner-up Danny Noppert and BDO World Trophy winner Peter Machin had already been confirmed to compete in next month's event, and are joined by the next five non-qualified players from the BDO rankings.
They include Wolverhampton's Hughes - who reached the second round on his debut last year - and Dorset-based Mitchell, the 2015 Lakeside Champion who will be making his third successive Grand Slam appearance.
England's Mark McGeeney, the World Masters finalist in 2016 and 2017 and current BDO number one, and Scottish duo Ross Montgomery and Cameron Menzies will all make their debut in the Grand Slam of Darts next month.
The £450,000 tournament will see the field of 32 players split into eight groups, with the top two in each following the round robin phase progressing to the knockout last 16 onwards.
Last weekend's World Grand Prix winner Daryl Gurney and runner-up Simon Whitlock were the latest PDC players to book their spots in the Grand Slam when they qualified last weekend.
Further opportunities for PDC players to qualify remain for the finalists of the forthcoming Unibet European Championship and Ladbrokes World Series of Darts Finals, with a final eight places on offer at the PDC Tour Card Holders' Qualifier on Monday November 6.
Grand Slam of Darts: Qualifiers so far
PDC
Michael van Gerwen, Phil Taylor, Daryl Gurney, Corey Cadby, Peter Wright, Mensur Suljovic, Raymond van Barneveld, Gary Anderson, James Wade, Simon Whitlock, Berry van Peer, Gerwyn Price, Dave Chisnall, Mark Webster
BDO
Glen Durrant, Danny Noppert, Peter Machin, Mark McGeeney, Jamie Hughes, Scott Mitchell, Ross Montgomery, Cameron Menzies
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