You should not forget that the United Kingdom has a substantial number of historical manuscripts at public disposal and that some of these may well hold vital information for you. Files from 1911 are almost complete. Enclose return postage please. Many male members of these professions belonged to the Masonic Order .
Contributions are always welcome.
The Lord Chamberlain's Archive at the Public Record Office contains material relating to plays etc. Theatres required a license from 1841. Also gives information on mailing-lists for those interested in similar studies. There are some non-statutory returns in the Public Record Office which may contain information relevant to foreign events. Because these are non-statutory they may be very localised in coverage and limited in scope.