session vs. lecture

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Common Errors in English, Advanced Level

ESL/EFL Test #6 "At the Conference", question 7

There was such overwhelming support for the sitting on psychology that the organisers decided to repeat it in the evening.

(a) overwhelming
(b) sitting
(c) that
(d) to repeat

Common Errors in English, Advanced Level

ESL/EFL Test #6 "At the Conference", answer 7

There was such overwhelming support for the session on psychology that the organisers decided to repeat it in the evening.

Correct entry: session
The error was: (b) sitting

You have found the error but your entry is incorrect.
There was such overwhelming support for the lecture on psychology that the organisers decided to repeat it in the evening.
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I used lecture. Why would lecture be wrong here?

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[Mister Micawber]

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'Lecture' is not wrong, but the idea is to find a similar word to the incorrect word.
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Native English teacher at Mister Micawber's