To make plans or arrangements:

plan verb
to think carefully about a series of actions that you need to take in order to achieve something

arrange verb
to make plans for something to happen, for example by agreeing a time and place


MAKE A PLAN (snuć plany, planować)
a series of actions that you think about carefully to help you to achieve something make/work out/outline a plan:
We need to make a plan before we can start on the project.


MAKE AN ARRANGEMENTS (dokonać uzgodnień, ustaleń, poczynić dane ustalenia)
a way of organizing things so that problems are solved or avoided make an arrangement:
Her husband is away, so she'll have to make other childcare arrangements.



http://www.macmillandictionary.com/dictionary/british/plan
http://www.macmillandictionary.com/dictionary/british/arrangement


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