Event delivery can be managed in a serverless computing environment. For example, an event broker can determine that each event message in a group of event messages from one or more event producers includes a particular key among a set of keys, and can determine a target event consumer that is to receive the group of event messages. Based on each event message in the group of event messages including the particular key, the event broker can add each event message to a dispatching queue in a sequential order in which the plurality of event messages were received. The event broker can then provide the group of event messages in the dispatching queue to the target event consumer in the sequential order in which the group of event messages are in the dispatching queue.