You can create KML files very easily, here is the official tutorial.
The easiest possible way will probably be this tip, taken directly from the tutorial:
- To see the KML "code" for a feature in Google Earth, you can simply right-click the feature in the 3D Viewer of Google Earth and select Copy. Then Paste the contents of the clipboard into any text editor. The visual feature displayed in Google Earth is converted into its KML text equivalent. Be sure to experiment with this feature.
The second approach to create a KML is to use a tool like this.
You will have to know only the exact latitude and longitude of the event's location.
After you create a KML, you can distribute it to your visitors as any other file.
the Telerik team