a. Asking about somebody's plans: What are you up to tomorrow?
b. Asking about somebody's plans: Do you fancy going to an exhibition?
c. Arranging to meet: What time shall we meet?
d. Arranging to meet: Shall we meet at the bus stop?
e. Responding to plans and arrangements: OK, about half past ten.
f. Responding to plans and arrangements: Fine, why don't we meet at the bus stop?
g. Responding to plans and arrangements: How about that, but where shall we meet if it rains?
h. Responding to plans and arrangements: Great! See you tomorrow.