Setting
They are sitting __ the table __ the first floor __ the library, __ the afternoon __ a weekday.
at - on - in/at - in - on
They are eating lunch __ a table __ a restaurant __ the mall, __ noon __ a Saturday __ July.
at - in/at - in/at - at - on - in
They are floating krathongs __ a river __ Thailand __ Loi Krathong Day __ November.
on/at - in - on - in