It's called an off-licence, or an offy.
It comes from the licence for selling alcohol for consumption off the premises.
Employees or associates.
Yes, Rhode Island package stores are open on Memorial Day.
Individual liquor stores might be closed, but it is likely that most are open. If you have doubts about a store being open, it is best to call the store.
Not anymore
After prohibition when it became legal to sell liquor again the law required (and still does) that liquor for sale must be in a sealed container and put into a bag or other package before it can leave the store. SO it was referred to as packaged liquor from a package store.
Of course, although not all liquor stores are open on Sundays. Each store is different so you must call to check the hours.
People from London NEVER call it 'London England', they just call it London. Only people from the USA call it 'London England'.
Der liquor
Grocery store
Here in England we call Mount Everest just that......Mount Everest.
England is the country name. People from England are English. Things from England are English. The language of England is English.
Presents or gifts.