It is more rewarding for him to join the congregation in the masjid but if the masjid is far away or this is for Tahajjud, this is permissible. Kindly refer to the following link(s): https://islamqa.info/en/2034

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The sunnah is to greet the muslims with salam – assalamu alaikum – when meeting them and when parting with them. However, whatever you have mentioned is permissible to be said.

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If she authorizes you, this is permissible.

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The rule for  the walimah is, generally, that it must be organized and paid for by the husband, however it is permissible for the couple to organize it together if this is what they agree upon. Any other spending should be as per the agreement of the parties involved.

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