If you're sure of the contents, or have tested pure crystals/powder.
I recommend this for a wicked night out! (Although you will come down pretty hard!)
Drop 80-100mg MDA.
Spew an hour later. Feeling goood and munted and one of your eyes possibly crossed and evil looking!
Enjoy the MDA high for a while, but not too long, you still want to be on the MDA peak when you have MDMA.
Drop an MDMA only pill (or snort around 50-90mg if you have crystal, depending on how the substance effects you).
You will experience a very, very blissful peak. When it starts to wear off you will still be rolling really, really hard! And sweating your nuts (or tits) off!
You may decide to re-dose when the full MDMA empathy wears off a couple hours later, but don't make it too much, about half or so of the MDMA dose.
After this second MDMA dose there is no use taking anyore MDMA, it just makes you feel more fucked tomorrow without really increasing current effects. But you can take a modest MDA dose and get back up to that peak. Don't take too much though, it will kick back in really fast! From 5-15 minutes.
Try not to take anymore after this it's just asking for trouble, at least a bad comedown with a terrible headache, or worse, extreme pissing troubles.
Smoking pot will help you get your body temp down a bit but it will make you hallucinate. Nitrous will make you fucking crack (especially on top of the pot). So if you can handle the insanity, go for it, but yeah, you might come out of trips screaming so try to do it somewhere safe.
Oh and Always monitor your water intake (not too little or much ofcourse, especially with this combination!), and take breaks outside the club/rave to get fresh air.