Sample datasets are publicly available for ILC detector studies via anonymous ftp from ftp://ftp-lcd.slac.stanford.edu/lcd/ILC. These include LCIO event files and (usually) the Stdhep files used to generate them. You can use a browser such as IE or Firefox to navigate the FTP directories.
The top-level directories correspond to specific machine parameters or diagnostic event types.
This is the substructure under each of the above directories.
Relative to the top-level dataset directory, LCIO output for ZPole events simulated with SLIC using the sid01 design can be found at
ZPole / sid01 / slcio / slic.
The corresponding logical structure is
event type / detector / data format / simulator.