The planetarium is not crowded on Wednesdays, so we should visit it then. Is this sentence an appropriate opening sentence for the purpose of the argument?

The planetarium is not crowded on Wednesdays, so we should visit it then.

This is an appropriate argument, and one that is valid. Why go to the planetarium on a crowded day. As to your question, yes, this sentence is an appropriate opening sentence for the purpose of an argument. You are stating your claim and suggesting a resolution.

No

Explanation:

It jumps to a supporting reason without clearly stating a stance