Update planner.py

- \ added to @get path for show_event(). Note: show_event is currently not being accessed unless the static() function is commented out.
- hget changed to hmget (I'm a nubcake for not doing this in the first place, tbh!).
- key concatenation to search event hash was not needed since the full event:acctno:eventno is retrieved (great idea there, Brian!).