The addevent method can only be used for a single timeseries object The second argument of addevent must be an tsdata.event object. When adding event(s) by name, the names must be specified by using a cell array of character vectors or a string array. When adding event(s) by name, time values must be specified by using a cell array of date character vectors, an array of strings, or an array of numeric times. When adding event(s) by name, the name and time cell arrays must have the same size. When adding event(s) by name, the names must be specified as a character vector/string or a cell array of character vectors/strings.