Is it legal to hold a bake sale outside of a Walmart in California?

I am in a school club that raises money to support a well known non profit organization. We have already received permission from the non profit to hold a bake sale, and we have a letter confirming its non profit status. We would like to hold the bake sale outside of a Walmart or other grocery/retail store. Is... show more I am in a school club that raises money to support a well known non profit organization. We have already received permission from the non profit to hold a bake sale, and we have a letter confirming its non profit status.
We would like to hold the bake sale outside of a Walmart or other grocery/retail store.
Is this possible?
Update: We will only sell if we have the store's permission
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