To usher or escort
I believe the answer is:
marshal
I believe this is a double definition.
'to usher' is the first definition.
(marshaling is a kind of ushering)
'escort' is the second definition.
(thesaurus)
(Other definitions for marshal that I've seen before include "Assemble and arrange" , "High officer" , "Arrange; senior officer" , "star part in a Western" , "Event supervisor" .)