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A summary field from a related table will show a value based on the set of related records from the context of a single record in your found set. It won't produce a grand total based on all the records in your found set.
perhaps you can base your layout on the art table instead of event art.
define a calulation field in event art. It can either copy the summary field from art or use a function such as sum to compute the same value. Then add a summary field to event art that totals this calculation field.