I'm very confused too. Looked it up and I think lease line means exterior of store.
lease line
The limit of the tenant space, either physically demarcated (by a demising partition or demising wall) or imaginary, controlled by the tenant of a leased, typically retail space, in a multi-tenant establishment, such as a mall.
Merry mission probably means Christmas themed products. If you find out more, let me know!
I was irritated that they only allow Saturday shops between 11-1. It is not in the guidelines but stated in the questionaire. I had to reschedule the shop after I already blocked out my afternoon.