2: He's giving you instructions or explanations before a ceremony. He told you what order people would line up for the procession. Maybe he also told or showed you the order of actions: when and where the procession would walk and sit and so on.
If it said "walked me through the procession" it would be ambiguous without more context. The order of the procession tells you what he's walking you through is abstract, the description of or plan for the thing, not the thing itself.