A tribute to something at nine

Has it really been two decades? 
I don't feel all that old
But I've found myself again
That does things, truth be told
Maybe youth is overrated
Years not things to detest
It means that I am still alive
In the end, the only test

A really big Dealy at eight

The man waved at the crowded street
Many of them all waved back
People seemed pleased to be there
And yet, looking back
Somebody had other plans
For the nation to see
When those shots rang out that day
We were stained with history

Lots of affirmations at eight

A double-negative, in English, 
Is a positive they say
A double-positive, in French,
Is what we call Yé-yé 

It's warming up down there at eight

 An arctic front due this weekend
Things will be getting colder
I thought I'd warm it up a bit
With Brazilian bossa-nova

Get this party going at eight

Yes, I've been a way a bit
How long has it been?
Either way, I'm back again
Plus, it's Halloween