Things you have to carefully plan or organize are logistical. If you need logistical help planning a party, you could use assistance planning the guest list, menu, music, and other details.
A logistical problem occurs when your plans didn't account for something: "You forgot to get a permit for this parade, and now the marching band and floats are causing a traffic jam — what a logistical nightmare!" Logistical things can relate to strategy or management, though this adjective originally meant "pertaining to logic," from the Greek logistikos, "endowed with reason."