Likely the LAX-MCO red eye will be fine but for such an important occasion I'd be nervous as well.

If something goes wrong on the red eye there is a 10:45p, 11:35p to ATL which would get you into MCO Saturday around 9am. Also there is a 10:33P LAX-RDU-MCO which has more availability and probably a better UG chance for a more comfortable red eye but no lie flat seats on this route.

So either way you have you options if something goes wrong. If anything does go wrong with your flight(s), tell delta what you want rather than letting them dictate to you which flights to put you on. the automatic re-book is rarely the most ideal flight in the case of MX or WX.