Did they wait for the wedding night or didn't they?

I wrote it also elsewhere, I believe they waited because in those times that was the normal route of events. 
The wedding was set on a date really soon, maybe a week, maximum 15days, because the Captain knew that the anschluss was coming so I believe this was the reason he wanted to get married soon, and get away with his children, he had decided in his mind to leave when the nazis would invite him to join their navy. 

I also believe that from the moment the Captain announced that he was going to marry her, Maria no longer stayed at the villa but returned to the abbey, from where she left in her wedding gown for the chapel. 

At the reception we all know, I think his social circle was invited. At the church, every Salzburger was there. The baroness had high prestige surely but I imagine that everyone would understand or at least suspect that Maria was a more family-type woman than the partying baroness. 
As Georg is rich and a naval hero, I don't think that he cared much about what people say or imagine about his personal life, and especially in a pre-war time. And also the fact that the marriage was so prominent and ostentatious with the Archbishop and other priests there and Maria going out from the abbey with all the nuns accompanying her, singing and praising her (because I consider that the ''how you solve a problem like Maria'' is a praise for Maria and not a blame, if we think about the rest of the lyrics, the words praise her free spirit and independence), all this suggests that things were done in the right order. 
If Georg was asked what happened to the baroness he could say that she missed Vienna and returned back. And since he is a widower with seven children who would blame him for marrying a woman who knows how to keep up a family? If he married Maria in a restricted circle without such a crowd of people, archbishop and nuns, and generally he did not make a fuss around his wedding, then maybe people would suspect that he got Maria pregnant. But in this case the movie shows a huge celebration with all the showing off of a royal wedding. 

I'm sure that even though they waited, it must've been difficult and they probably (for lack of a better term) had a few close calls.

I agree. I do also wonder though, how many close calls they actually had. I assume that there wasn't too many because of the amount of chaperones they probably had. 

I doubt they would have went very far or done anything particularly scandalous. Although it is clear that Maria is very passionate, she has just been sprung from the Abbey, had her heartbroken and found out that the love of her life does indeed love her back, all in a relatively short time period (if not in the same day.) I therefore doubt there would have been anything other than a few (or more) passionate kisses on the sofa in his study because what she has been through is very overwhelming and I think he would be content enough just to hold her and be in her presence. I also think they would have spent a lot of time just talking to each other because there would have been a lot that needed to be discussed.

Whose bed? Good question! Let's say things did go...father than they intended after the gazebo. What room would they end up in? The couch in his study does not seem romantic enough. Her room was in the staff wing, so maybe this was out. His room is the only choice then. Would she have to sneak back to her room in the middle of the night or could she stay and cuddle until morning? what time does the staff get up? What time do the children get up? 

Wait, I voted that they waited!! I'm not sure how I'm now plotting which room they ended up in together the night of their first kiss. hahaha.

In that case, whose bed could still be a valid question.  They could still be alone together, but not get carried away. Maybe gazebo night is too aggressive for a sleepover, though, later on in the engagement maybe they figured out a way to outsmart their chaperones for some nighttime snuggle time. 

I think that they waited for the wedding night, but I feel that Georg had more control than she did. Everything was so new to her and feeling the rush of all these new feelings, but even so I think that she would have stopped them too at some point from going all the way.

I voted that they waited. I think Georg was to much of a gentleman to go all the way before the wedding.

I’m 50/50.

In real life, yes.
In the movie, R&H want us to believe so

In my head? Nah . You have a very passionate young woman discovering what love is, a “dangerously handsome” (as Julie said) Captain who has shown his absolute romantic side, he’s already got 7 kids so we know he likes to “groove”. He’s also been a widower for quite some time, she’s lovely, he’s been silently in love with her, she’s under his roof., the tension between them could be cut with a knife for so long. If they did wait, it was by the skin of their teeth.

I may also be projecting heavily- If I were Maria, forget it. “Nun? What nun? I was going to be a nun?”

Love the theories and thoughts!

I also think that they waited, but as pointed out multiple times, the wait was absolutely tortuous for both of them and both have come close to "Losing It" more times than they care to count.

I mean... strong feelings, thrown haphazardly into the unconscious as if it were something dangerous, were finally allowed to be expressed after being forced out. And then there was the overwhelming sensation that they couldn't be together, and then they could, and then them getting engaged within minutes of confessing their love. Honestly, given these, how do you expect them to behave around one another? Dangerous game, tbh, but "righteousness" and belief saved them from completely succumbing, I guess. I would also like to think that they did have a few passionate moments. I really don't think they could have avoided it even if they did try their best to hold onto their control.

I’m glad Chris&Byng brought this back up, because I somehow missed a lot of this conversation. And I guess I must have voted “no” originally, but I’m going to change my vote and say “yes,” just because I have written it every which way and I guess this rings truest to me. I probably am not giving enough weight to her religious faith.
In my stories there is always a hidden staircase that goes to his bedroom. Convenient huh?
In the story I”m writing now there is a whole hidden ROOM!

I voted "yes", they waited.

My thought is that, if you are so Catholic you are trying to become a nun (whether successfully or not is a different question), you are much more likely to stick to the societal norms of the church at the time. If Maria is apologizing for singing outside of the abbey only to later be reminded that rule only applies IN the abbey, I would think anything she believes to be God's rule would be taken very seriously. And while I doubt the Captain would share that same true depth and conviction of faith, I'm unsure how he would balance his position in society, how unusual their relationship is considering it is NOT a disreputable relationship between the employer and the governess, and him being somewhat protective (of both his children and Maria), if he was to disrespect that contemporary norm of the church. And when it comes to protecting Maria, we all know there's a stupid double-standard for men and women; right or wrong (*cough wrong cough*), it exists and is sometimes severe.

Chris&Byng, the situation you described with your grandmother is the only situation I can see as plausible, but even then, I still struggle with seeing that between these characters. But all this is just my weak analysis.

But as for thought experiments and fluff...I can have as dirty a mind as anyone else.

Oh absolutely, I totally understand what you are saying. My father's entire paternal family is Catholic (along with him and his sisters), and in that cluster there were definitely moments of "had to get married". And fortunately, it has usually worked out in the end. (Also occurred in my mother's very Pentecostal family.) I guess my thought remains that if you want to become a nun, your standards of what are acceptable are different. (But you understood that, I'm not that smart of a person!) Although I CAN see what you described as possible (re: no one would ever know), I still struggle with it for these characters.