move datestamp to beginning of line where available

Shell Programming and Scripting
1

My current output is as follows:

All Day Event
Someone's Birthday
Class 7:00 PM
Pick up dry cleaning 1:00 PM
Wake up 8:00 AM

I'd like the output to remain the same but have the times moved to the beginning of the line with a hyphen after it so it would look like,

All Day Event
Someone's Birthday
7:00 PM - Class 
1:00 PM - Pick up dry cleaning
8:00 AM - Wake up

I assume that this can be done with awk and regex? I'm just not sure how.

I tried searching but have no idea what I'm trying to do would even be called.

The closest I got was

awk '{if ( $NF == "PM" || $NF == "AM" ) { print $(NF-1),$NF,"-",$0 } else {print $0}}'
2 
nawk '$(NF-1) ~ "\:[0-9][0-9]" {print $(NF-1),$NF,"-",$0}' infile
3 
sed 's/\(.*\) \([0-9][0-9:]* [PA]M\)/\2 - \1/'  myFile
4

my output is showing up as

All Day Event - All Day Event
Someone's Birthday - Someone's Birthday
7:00 PM - Class 7:00 PM
1:00 PM - Pick up dry cleaning 1:00 PM
8:00 AM - Wake up 8:00 AM

That did it. Thanks!