Yesterday it was our very own Chapter House. The rather scary modus operandis is explained here. You have to take a prop, so I grabbed my trusty tiffin-box and joined the throng, rather fearful that we were about to get some sort of guerrilla operation along the lines of John Gorman's militant "Masked Poet" from TISWAS all those years ago.
In fact it was great fun, and I was delighted to see my prop featuring prominently. Polonious handed it to Laertes as he bid him farewell on his return to France. Laertes brought it with him when he came back to the court on learning of his father's death, then he and King Claudius kept handing it back and forth between each other as the plot against Hamlet was hatched.
A ruined Chapter House is indeed a fine place to emote:
Tis now the very witching time of night,
When churchyards yawn and hell itself breathes out
Contagion to this world: now could I drink hot blood,
And do such bitter business, as the day
Would quake to look on.
http://www.seehamlet.co.uk/ for future weeks.