Hello James
A common pattern among our enterprise-scale Event Editor deployments is to create business-unit and task specific configurations for editing events. In a practical sense, this means that for each configuration of Event Editor you'll publish one LRS-enabled service with only the event layers required by the end users' maintenance needs and then should they wish to have additional LRS event layers or other reference data layers (e.g. polygon boundaries etc) in their configuration you'll simply publish those layers as map services without LRS capability enabled.
From your Portal you'll then manage access to those web layers through group sharing at the service, webmap, and app item level. Each Event Editor configuration will have a default webmap with the one LRS-enabled service and then you can also add in any number of reference map layers so long as they are not LRS-enabled.
Hope that helps. If you have any other implementation questions please do not hesitate to ask.
Amit@esri