Question 1: Do you think Meghan will give birth at Lindo Wing? Or some more private hospital?
Answer: Nothing has been officially announced yet, but I would expect Meghan to give birth at Lindo Wing. There is going to be such a media circus around the birth, that you want to keep things as organized and with at least chaos as possible. Having a carefully orchestrated plan is what gives the family the most privacy. The Palace and media have already worked out the kinks with Lindo Wing. It's a difficult balance of giving the Sussexs privacy, allowing the hospital to continue its work in a calm manner, and acknowledging public interest.
Lindo Wing works well.
Question 2: Which Royals will be at the Commonwealth Awards 2019?
Answer: There are a number of Commonwealth related awards. But there is no "Commonwealth Awards." (Except for the Commonwealth Awards in Pennsylvania, USA. But that has nothing to do with the British Commonwealth.)
So, I'm not sure what you are referring to exactly. I know there is a Youth Commonwealth Awards on the 13th. No, Royal has been announced as attending that. And we don't normally see any royals there.
Question 3: Will the Royal Family have to contact Twitter or the user of @SussexRoyal account to use the name on twitter? The account was created 2010 but hasn't been used since 2014
Answer: They might. It also possible the Sussexs could use a different handle on Twitter. But anyways the palace has said that they don't have any plans on starting a Sussex twitter account right now.
Question 4: If Her Majesty attends a Royal Wedding are members of the Royal Family expected to attend? Are Senior Royals expected to attend?
Answer: No. No one is expected to attend a wedding (or funeral, etc.) just because the Queen does. But, obviously, if this is close family or close friends we often see a bunch of other royals attending as they are close to the person as well.