Model:
Event:[id,name]
Requirement:[id,name]

public function store(Request $request)
    {



        $summary=[
            'name' => $request->fullname,
            'email' => $request->email,
            'company' => $request->company,
            'event' => $request->event_id,
            'requirement' => $request->requirement_id
        ];
        return $summary;
       Mail::send('emails.contact-message',[
        ],function($mail) use($summary){

            $mail->from('myemail@gmail.com', 'tester');
            $mail->to('myemail@gmail.com')->subject('Contact Message');
        });
        return redirect()->back();


    }

{"name":"myname","email":"myemail@gmail.com","company":"mycompany","event":["1","2"],"requirement":["1","2"]}