New week and new .NET Core 3.0 preview means a new 1.3 version of Blazor.EventAggregator. For those who are not familiar with the project, Blazor.EventAggregator is a lightweight Event Aggregator for Blazor. Event aggregator is used for indirect component to component communication. In event aggregator pattern you have message/event publishers and subscribers. In the case of Blazor, component can publish its events and other component(s) can react to those events.

You can find more information about the project from the introduction post or from the project site.