What are legal ramifications of renting my extra garage to a neighbor for a rummage sale?

Question Details:

I am a renter who rents a duplex with attached garage, plus the additional unattached garage. An older lady who lives nearby wants to rent/ use the garage to hold a rummage sale from Wed-Saturday. Are there specific legal implications- how can they be avoided? If I post signs denying liability, will that be helpful?

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