The setting was apparently an open room. "...restrictions included no tables or booked seating and only a standing audience/cocktail party," says the event's organizer in the story.
I can see if the event planners had people seated at tables and Dynamo traveled from table to table. With no tables or distinguishable groups, the other alternative would have been to create a single line with Dynamo at the head - much as in a reception line at a wedding - and he could perform for ten people at a time in a single setting. Dynamo would then time his performances so everyone would have an opportunity to see him within the event's duration.
I can confidently say from experience that at some events, time-management and crowd-control skills are as important, or more important than magic skills. This event was definitely one of them.
You can read the entire story here.