Update participants

PREPARATIONS.md

@@ -38,20 +38,23 @@ Very preliminary, please update, extend, or comment.
 
 ## Participants
 
-Our current list (not yet confirmed):
+Confirmed:
+
+- Angga Fuady
+- Tooba Tabbassidaloii
+
+Not yet confirmed:
 
 - Saeed Katiraei
 - Rick de Leeuw
 - Roel Zinkstok (ONCO)
 - Martijn Eenink (ONCO)
-- Tooba Tabbassidaloii
 - Soheil Yousefi
 - Tarek Malas
 - Jonathan Vis
 - Thomas Chin-A-Woeng
 - Sake (?)
 - Niels (?)
-- Angga Fuady
 
 
 ## Course materials