<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def cli(env, identifier, ack):
 """Details of a specific event, and ability to acknowledge event."""


    # Print a list of all on going maintenance
    manager = AccountManager(env.client)
    event = manager.get_event(identifier)

    if ack:
        manager.ack_event(identifier)

    env.fout(basic_event_table(event))
    env.fout(impacted_table(event))
    env.fout(update_table(event))