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I have some not so good news for you buddy... I don't think that's something that can happen. I've asked Dexter about that in the past (wether I could one day propose on stage) and he said like "Dude, I am sure you can think of way more romantic ways to propose than that". It wasn't a specific request or anything just a kind of general enquiry, but I don't think the chances are so great. If anything if you are lucky you may be able to propse perhaps before they take the stage, but for that you would need to get premission from the venue and promoters like that (they would also probably run it by the band).
Anyway lots of luck, but I wouldn't set my heart on it.