#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;

my $more_rec = {
  '1'=>{ 'agenda' => 
          [ {'YEAR'=>'2008','MONTH'=>'MARCH',   'COLOR_CODE'=>'1' },
            {'YEAR'=>'2014','MONTH'=>'APRIL',   'COLOR_CODE'=>'2' },
            {'YEAR'=>'2014','MONTH'=>'DECEMBER','COLOR_CODE'=>'3'},
          ], 
       },
  '2'=>{ 'agenda' => 
          [ {'YEAR'=>'2001','MONTH'=>'MAY', 'COLOR_CODE'=>'1' },
            {'YEAR'=>'2009','MONTH'=>'JUNE','COLOR_CODE'=>'2' },
            {'YEAR'=>'2001','MONTH'=>'MAY', 'COLOR_CODE'=>'1' },
            {'YEAR'=>'2009','MONTH'=>'JUNE','COLOR_CODE'=>'2' },
            {'YEAR'=>'2013','MONTH'=>'JULY','COLOR_CODE'=>'2' },
            {'YEAR'=>'2016','MONTH'=>'SEPTEMBER', 'COLOR_CODE'=>'4' } 
          ],
        },
};

my $recs = collect();
print Dumper $recs;

sub collect {

  my @all = ();
  foreach my $number ( keys %{$more_rec} ) {
    my $ar = $more_rec->{$number};
    for my $mth (@{$ar->{'agenda'}}){
      push @all, $mth;
    }
  }
  return \@all;
}