A little while back now Dr. Jiří Kroupa collated various papers from the Prague Zelenka Conferences 2017-2019: http://www.acecs.cz/cu_2019_08.php
Here is the list of articles:
DRISCOLL, Michael: Zelenka's arrangements of Dixit Dominus settings by other composers
KAPSA, Václav: The place of Jan Dismas Zelenka within Prague's sacred music scene as viewed through the inventory of the Knights of the Cross with the Red Star
KIERNAN, Frederic: Wolfgang Horn and Zelenka
ÓSKARSSON, Kjartan: Zelenka and chalumeau
SANYAL, Sebastian: The Zelenka family in Louňovice: Some findings from local history and parish registers
STOCKIGT, Janice B.: The genesis and evolution of Missa Sanctae Caeciliae (ZWV 1), Jan Dismas Zelenka
VOKŘÍNEK, Lukáš: Kmotrovství v rodině kantora a varhaníka Jiříka Zelenky Bavorovského [Godparenthood in the family of the schoolmaster and organist Jiřík Zelenka Bavorovský]
These are well worth reading, enjoy!
There is also an article by Jóhannes Ágústsson in Clavibus Unitis 2020, on the diaries of Crown Prince Friedrich Christian.