organisieren
to organize
To plan and prepare an event, activity, or project.
Wir müssen noch die Musik für die Party organisieren.
We still need to organize the music for the party.

to organize
Loading your saved state.
to organize
To plan and prepare an event, activity, or project.
Wir müssen noch die Musik für die Party organisieren.
We still need to organize the music for the party.

The verb 'organisieren' (to organize) belongs to a word family. 'Die Organisation' (the organization/organizing) is the action or the group, and 'der Organisator' (the organizer) is the person who organizes something.
Die Organisation des Festivals war eine große Herausforderung.
The organization of the festival was a major challenge.
The verb can also be used reflexively: 'sich organisieren' (to organize oneself/themselves). This can mean that a group of people joins together, or that a person structures their own life or work.
Die Mitarbeiter organisierten sich, um bessere Arbeitsbedingungen zu fordern.
The employees organized themselves to demand better working conditions.
In the meaning 'planen' (to plan), 'organisieren' (to organize) is typically used with events and activities. For example, you can organize a party, a trip, a meeting, or a demonstration.
Wer organisiert dieses Jahr das Sommerfest der Firma?
Who is organizing the company's summer party this year?
The meaning 'beschaffen' (to obtain) or 'besorgen' (to get) is very informal and is mainly used in spoken language. This use should be avoided in formal or written contexts.
Kannst du für die Feier noch ein paar Stühle organisieren?
Can you arrange a few more chairs for the celebration?
to plan
'planen' and 'organisieren' both have to do with preparation. 'planen' emphasizes more that you are thinking something through for the future: What should happen, when, and how? 'organisieren' often goes one step further: you also take care of the practical side so that everything works, for example rooms, times, people, or materials. Learners may confuse the words because you can both plan and organize a party. As a simple guide: with 'planen', the idea or sequence of events is in the foreground; with 'organisieren', the practical order and preparation are.

Sofia organisiert für die Besprechung einen Raum und Getränke.
Sofia is organizing a room and drinks for the meeting.
Für das Wochenende planen wir einen Ausflug an den See.
We are planning a trip to the lake for the weekend.