You can use the Dissolve Route Events tool to aggregate event data.
The Dissolve Route Events tool will combine events that have overlapping measures. Use this tool to remove redundant information from event tables or break up event tables having more than one descriptive attribute into separate tables. The result will be written to a new event table in the workspace of your choice.
Select concatenate when you want to only combine events in situations where the to-measure of one event matches the from-measure of the next event. Select dissolve when you want to combine events that have overlapping measures. You can dissolve or concatenate on one or more fields.
You can choose to have the resulting table added to the map as a feature layer, as a stand-alone table, or not at all.