What does this idiom mean: to go on a date?

[Rumi]

Test No. incompl/elem-23 "On TV tonight", question 10

Because after the news Penny and I are ......... on a date.

(a) doing
(b) making
(c) going
(d) taking

Test No. incompl/elem-23 "On TV tonight", answer 10

Because after the news Penny and I are going on a date.

Correct answer: (c) going

Your answer was: n/a
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I have no idea. Is this an idiom? Please give me more information.

[Alan]

This means go out with someone to a cinema/party/dance/restaurant.
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[Watie]

Hi Alan..

The sentence : Because after the news Penny and "I are" going on a date. isn't it : Because after the news Penny and "I am" going on a date.

Am i right??