Don’t panic, you won’t need a lawyer for your child’s fifth Birthday Party, or your Company Holiday Party. At the very least, an informal signed contract will assure both parties will leave happy, and that is my first goal. You need to define a starting time and finishing time. The clients should be informed in advance that you may be booked for another show after theirs. Let them know how you will be attired.
Assure them you will not ruin their home. Leave everything the way you found it. I never do any effects which require liquids, fire, or latex items. This may comfort a client if it is in writing. Use your contract to create a comfort zone for both parties. Make sure the client and the Magician sign the contract. less than that it’s just paper.