So, I am suggesting to Larian that they do not make it so that Familiars and Animal Companions unsummon. They should not. You should be able to summon them on Day 1 when you crash on the beach, and if you are smart about them and keep them alive, you should be able to keep them with you the entire adventure without ever having to summon them again. Thus, on Day 2, you can have your Familiar in the party without using a spell slot to summon them
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