Couple questions-Frozen, Dining and Cribs

So I have a couple questions...The second question is dependent on the first question.
1-How likely do you think it would be that the would extend the Frozen thing? We are getting to WDW on 9/27, and had planned on going to MK on the 28th. We are celebrating our son's 1st birthday, and wanted MK to be our first park. If they don't extend it, we may have to switch our plans.
2-If they don't extend Frozen, we will need a new ADR. Of course, everything is booked in HS, except Hollywood Brown Derby. The strange thing is, it says they don't accept the dining plan. Is that true? I've been there before and they have.
3-We asked for a crib, what are they like, and what's the chance that they won't have one available? The woman on the phone reminded me that it's not guaranteed. Our son is not ready to sleep in a bed, he loves his crib (and pack and play when we travel). Should we bring our own crib sheet? Would a crib sheet or pack and play sheet fit better?

Thanks! 47 days till our trip!

Disregard question #2...I realized it wasn't Brown Derby, but the Brown Derby Lounge.

If you want to guarantee you'll have a crib you can always rent one from an outside company. We used Orlando crib rental. (Can't post the link, you can google it). A pack n play is 40$ for the week or we rented a full sized crib for 75$. They were very nice and delivered right to our room and set up for us. Would absolutely use them again for piece of mind (and a good night sleep)!

Frozen Summer Fun at Disney's Hollywood Studios is extending through Sept. 28 - so you could possibly make it if you rearrange your days.

I stayed at AS Music in January and there was a crib available. I considered renting, but felt it was pretty unlikely disney wouldn't have one since we were not traveling during a peak time. I did have to ask several times before it finally arrived and thankfully it got there by bedtime. Disney's "crib" is actually a pack and play and they provided two sufficient, but very thin, sheets. I packed my own quilted sheets and opted to use those.

Thanks! He's ok in a pack n play, I'll defintely pack my own sheets.

They announced this extension weeks in advance, so there is a good chance if it does extend again you will hear by mid September. If I had to make a guess (and I am just guessing), I would predict that at least some parts of the Frozen events will continue for quite a while. Since the September extension limited the fireworks days, I think we can assume it is the most expensive and/or difficult part of the package and may only be seen at peak times.