organize (to make arrangements for something): We are organizing a trip to Italy. I will help you organize the party.
arrange (to organize or make plans for something): I will arrange a meeting with her.
sort out informal (to organize, resolve a problem): You take care of the food; I’ll sort out the drink. I need some time to sort out my life.
plan (to decide on and arrange for in advance): My father plans to take us to Canada.
set up (to arrange for something to happen): I will set up a meeting to discuss the problem.
orchestrate (to organize a complicated plan very carefully, especially secretly): He was able to orchestrate the rebellion from behind the bars.
fix up British English (to arrange something): I’ve fixed up a party for him tonight.