The list can be either a range of cells that contain holiday dates or an array constant, for example:
=WORKDAY(A1+1,-1,C1:C10), or
=WORKDAY(A1+1,-1,Holidays), where Holidays is a name that refers to C1:C10, or
=WORKDAY(A1+1,-1,{"2017-03-30","2017-03-31"}), or
=WORKDAY(A1+1,-1,{42824,42825})