Which ones are correct?
1. The time and place for future meeting will be set soon.
2. The time and place for future meetings will be set soon.
3. The time and place for the future meeting will be set soon.
btw I know the first one is incorrect but I need to prove it to someone.
(2) and (3) are correct (obviously they mean different things). (1) is incorrect, as you say. As a singular countable noun, the word "meeting" needs an article or other determiner.
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(2) and (3) are correct (obviously they mean different things).
(1) is incorrect, as you say. As a singular countable noun, the word "meeting" needs an article or other determiner.