First I'd strongly suggest you watch the Laravel 5.7 from scratch series here on laracasts since most of the stuff you need is covered there.

The value that @siangboon are refering to as 1234 is the id of the record you just created.

$pastEventId = past_events::create($data);

Session::flash('success', 'New Blog has been Published on Website for Particular Menu');

return redirect()->route('past_event.store2',['id' => $pastEventId]);

What is this part?

   if($request->has('title'))
    {
        $data['title']=$request->title;
    }

    if($request->has('event_video_link'))
    {
        $data['event_video_link']=$request->event_video_link;
    }
    if($request->has('event_place_name'))
    {
        $data['event_place_name']=$request->event_place_name;
    }

You have already validated the request and this code wouldn't be executed unless the validation succeds. And you have already assigned the $data array before this code.