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When creating (1) a non working day you can specify its type, name and calendar date. Any added element here can be amended, or deleted, by using dedicated menu tied to each item (2). To find any already existing day, by searching its (partial) name, date, or type you can use filter field (3). By doing so you can limit the number of displayed elements and therefore easier spot an element of particular interest.
Important thing to note here is that it is up to you to decide of a "Type" of a non-working day. For your convenience, you can use additional information that goes better with a "Name" of a non-working day. By doing so you can limit the number of displayed elements and therefore easier spot an element of particular interest.