Techniques for a framework associated with a group-based communication platform for enabling applications to scale events to be distributable to various users over a communication platform are described. For example, a group-based communication platform may receive a message from a first application to send to a second application. The group-based communication platform may identify a topic and an event associated with the message. The group-based communication platform may then send the message to a queue associated with the second application, wherein the queue is associated with the topic and a user of the second application. The group-based communication platform may then cause presentation of the message to the user. In some examples messages may be sent bidirectionally, such that a message may be sent from the second application to the first application.