Later this month (at least in some locations) you can choose the form of madness you wish to see:

• • On Thursday, September 27, 2018 in select theaters is King Lear with Ian McKellen. The blurb at National Theatre Live:
    

    Broadcast live from London’s West End, see Ian McKellen’s ‘extraordinarily moving portrayal’ (Independent) of King Lear in cinemas.

    Chichester Festival Theatre’s production received five-star reviews for its sell-out run, and transfers to the West End for a limited season. Jonathan Munby directs this contemporary retelling of Shakespeare’s tender, violent, moving and shocking play.

    Click on the above link or the one for Fathom Events to find a venue screening it on the 27th. It will be interesting to compare McKellen’s performance now versus that of a decade ago with Trevor Nunn as director (which, coincidentally, is currently airing for free on Amazon Prime).

• Available on September 28th to Amazon Prime viewers is King Lear with Anthony Hopkins in the title role and directed by Richard Eyre. There’s nothing beyond a description of the play on Amazon’s site about the film, but plenty to find online from people that have already watched it. For the cast, see imdb.com.It’s raining Lear.