Hello Jonathon,
I would be curious to understand the method by which you have built the event layer. In Roads and Highways (R&H) there are two event registration choices; 1) ALRS event feature classes (internal events), and 2) external events. Our documentation on these choices can be found here.
Assuming you are using Event Editor (RCE) to edit events, you would effectively be editing internal events. As such, R&H manages the shape (geometry) of the feature based on the route, measure, and to and from dates. Of course, the shape of the routes are derived solely from the minimum schema centerline feature class. This model provides increased performance for mapping and spatial querying of the event data but will not allow for perpendicular offsetting like you may be used to in core linear referencing events.
To emulate core linear referencing's perpendicular offset capability for map rendering using R&H you'll need to register your event as an external event. This will allow you to specify offset field characteristics used for shape rendering. However, external events are read-only connections to the R&H ALRS and you'll need to develop your own external systems to manage and edit the tabular data stored outside R&H. External events are not managed in RCE.
Amit @ Esri
