ausgefallen
unusual
Unusual, extravagant, original, or not everyday.
Zu ihrem Geburtstag wünscht sie sich ein wirklich ausgefallenes Geschenk.
For her birthday, she wants a really unusual gift.

unusual / canceled
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unusual
Unusual, extravagant, original, or not everyday.
Zu ihrem Geburtstag wünscht sie sich ein wirklich ausgefallenes Geschenk.
For her birthday, she wants a really unusual gift.

'Ausgefallen' (unusual / canceled) is the past participle of the separable verb 'ausfallen' (to be canceled / to fail). The two very different meanings of the adjective come directly from the meanings of the verb: something 'fällt aus' (is canceled / does not take place) or 'fällt aus dem Rahmen' (stands out / is unusual).
Morgen fällt die erste Stunde aus.
Tomorrow the first class is canceled.
You can often recognize the meaning from the position in the sentence. If 'ausgefallen' comes before a noun, it means 'unusual'. If it stands alone after the verb, usually 'sein' (to be), it means 'canceled'.
Er hat einen sehr ausgefallenen Modegeschmack.
He has a very unusual fashion sense.
In the meaning 'unusual', 'ausgefallen' often describes things such as: 'ein ausgefallenes Geschenk' (an unusual gift), 'ein ausgefallenes Hobby' (an unusual hobby), 'ausgefallene Kleidung' (unusual clothing), or 'ein ausgefallenes Design' (an unusual design).
Sie sucht ein ausgefallenes Restaurant für ihren Geburtstag.
She is looking for an unusual restaurant for her birthday.
In the meaning 'canceled', the word is used for appointments and events. Typically, 'der Unterricht' (class), 'ein Zug' (a train), 'eine Veranstaltung' (an event), 'ein Flug' (a flight), or 'der Strom' (the power) can be 'ausgefallen' (canceled / out / failed).
Wegen des Sturms ist gestern Abend der Strom ausgefallen.
Because of the storm, the power went out yesterday evening.
normal
'normal' and 'ausgefallen' are opposites when talking about style, ideas, or things that are more or less everyday. 'normal' is ordinary and does not stand out in any special way. 'ausgefallen' is unusual, original, or somewhat extravagant. The word can sound positive, for example with clothing, food, or an idea. What matters here is not the meaning 'canceled', but the meaning 'not everyday'.

Sie hat zur Feier ein ausgefallenes Kleid mit vielen bunten Mustern getragen.
She wore an unusual dress with many colorful patterns to the celebration.
Für das Training reicht morgen ein normales T-Shirt.
A normal T-shirt will be enough for training tomorrow.