Adds event model to event-sub-topic serializer test (#760)
Adds event model to event-sub-topic serializer test (#760)


ritikamotwani/open-event-frontend,harshitagupta30/open-event-frontend,harshitagupta30/open-event-frontend,CosmicCoder96/open-event-frontend,CosmicCoder96/open-event-frontend,ritikamotwani/open-event-frontend,ritikamotwani/open-event-frontend,CosmicCoder96/open-event-frontend,geekyd/open-event-frontend,geekyd/open-event-frontend,geekyd/open-event-frontend,harshitagupta30/open-event-frontend