I think I'd have to have three separate parties, but overall...

• Bill Bailey
• Jo Brand
• Rob Brydon
• Jimmy Carr
• John Cleese (though maybe not recent, he seems grumpy now - who wouldn't after that many divorces)
• Helena Bonham Carter
• Benedict Cumberbatch
• John Finnemore
• Martin Freeman
• Stephen Fry
• Eric Idle
• Hugh Laurie
• Joanna Lumley
• Sir Ian McKellen
• Sarah Millican
• David Mitchell
• Steven Moffat
• Dylan Moran
• Michael Palin
• Sue Perkins
• Tony Robinson
• Jennifer Saunders
• Dame Maggie Smith
• Sir Patrick Stewart
• Sandi Toksvig

With the special guest of:

• Henning Wehn

Those who can come if the party goes on for about a week:

• Stephen K. Amos
• Ronni Ancona
• Richard Ayoade
• Ed Byrne
• Jeremy Clarkson
• Arthur Darvill
• Jack Dee
• Hugh Dennis
• Ben Elton
• Karen Gillan
• Richard Hammond
• Miranda Hart
• Sean Lock
• Paul McGann
• Lee Mack
• James May
• Dara O'Briain
• Chris O'Dowd
• Katherine Parkinson
• Matt Smith