
begehen
to commit
To carry out a negative or punishable act, such as a mistake, a crime, or suicide.
Er hat einen schweren Fehler begangen, als er die Warnungen ignorierte.
He committed a serious mistake when he ignored the warnings.
to commit / to celebrate
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to commit
To carry out a negative or punishable act, such as a mistake, a crime, or suicide.
Er hat einen schweren Fehler begangen, als er die Warnungen ignorierte.
He committed a serious mistake when he ignored the warnings.

to celebrate
To celebrate or observe an anniversary, holiday, or special event in a particular way.
Nächstes Jahr begehen wir unser 25-jähriges Firmenjubiläum.
Next year we will celebrate our company's 25th anniversary.

to inspect
To enter and walk through a place, site, or building, often in order to inspect or check it.
Der Architekt begeht die Baustelle einmal pro Woche, um den Fortschritt zu kontrollieren.
The architect inspects the construction site once a week to check the progress.
'Begehen' (to commit/to celebrate/to inspect) is an inseparable verb. The prefix 'be-' remains firmly attached to the verb 'gehen' (to go) in all sentence forms and is not separated.
Er hat einen großen Fehler begangen.
He committed a major mistake.
You can recognize the meaning of 'begehen' (to commit/to celebrate/to inspect) from the object: Is it something negative (mistake, crime), a celebration (anniversary, holiday), or a place (construction site, grounds)?
Der Dieb beging den Einbruch in der Nacht.
The thief committed the break-in at night.
In this meaning, 'begehen' (to commit) is used almost exclusively with negative actions. Typical phrases are: 'ein Verbrechen begehen' (to commit a crime), 'einen Fehler begehen' (to make/commit a mistake), 'einen Diebstahl begehen' (to commit a theft), or 'Selbstmord begehen' (to commit suicide).
Der Täter hat mehrere Straftaten begangen.
The perpetrator committed several criminal offenses.
The use of 'begehen' (to commit) for negative acts belongs to formal language, especially administrative and legal language.
Dem Angeklagten wird vorgeworfen, Betrug begangen zu haben.
The defendant is accused of having committed fraud.
In the sense of 'feiern' (to celebrate), 'begehen' (to celebrate/observe) is used with official or special occasions. Common combinations are: 'ein Jubiläum begehen' (to celebrate an anniversary), 'einen Feiertag begehen' (to observe a holiday), or 'einen Jahrestag begehen' (to mark an anniversary).
Die Universität begeht dieses Jahr ihr 100-jähriges Bestehen.
The university is celebrating its 100th anniversary this year.
This meaning describes a formal or official walking-through of a place, often for a specific purpose such as an inspection or check.
Vor dem Kauf wollten wir die Wohnung noch einmal mit einem Experten begehen.
Before buying it, we wanted to inspect the apartment once more with an expert.
to celebrate
Both words can refer to a special occasion. „Feiern“ is more general and usually suggests a cheerful celebration, while „begehen“ sounds more formal and can also refer to observing an occasion ceremonially, without an exuberant party. „Feiern“ is more suitable for a party, while „begehen“ is often used for a formal occasion.

Die Stadt begeht das Jubiläum am Samstag mit einer offiziellen Gedenkfeier.
The city is observing the anniversary with an official memorial ceremony on Saturday.
Wir feiern das Jubiläum am Samstag mit einem großen Fest.
We’re celebrating the anniversary with a big party on Saturday.