This is the text:

> ああ 僕 まだ 名乗ってませんね｡ あした お会いしたときに｡

It is referring to tomorrow, so I would naturally say: お会いするときに instead.

Why does he use a past form?

Thanks!
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2016-07-26T01:01:03.857
36975
2016-07-26T02:25:32.370
2016-07-26T02:25:32.370
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question
grammar aspect
Why this is written using past form?
There is not any past form, this is the _accomplished_ form.

"あした お会いしたときに" could be translated as: "once I met him/her tomorrow".  
So, even it this takes place in the future, the person is speaking about when
the action of meeting the other person is accomplished.  
Whereas お会いするときに is the time where the person _is about to_ meet (this is not
done yet) the other person.
CC BY-SA 3.0
2016-07-26T01:15:11.367
36977
2016-07-26T01:15:11.367
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answer