I think that Amphiaraos most of all dedicated himself to interpreting dreams: it is clear that, when he was considered a god, he set up an oracle of dreams. And the first thing is to purify oneself, when someone comes to consult Amphiaraos, and the purification ritual is to sacrifice to the god, and people sacrifice to him and to all those whose names are on (the altar), and - when these things are finished – they sacrifice a ram and spread out its skin under themselves, lie down waiting for the revelation of a dream.
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An inscription from the site, however, states that each man may sacrifice what he wants. Some variation in practice during the nine centuries of cult activity at the sanctuary may be expected. The baths of the site were famous in antiquity. The locations of a stadion and a hippodrome are unknown.