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Hi. Please help me write the correct questions to the following sentences which involves the use of the word "where."

1. He played at the beach?

Correct question? Where did he play?

2. He performed at/in a concert hall.

Correct question? Where did he perform?

3. He spoke at the get-together.

Correct question? Where did he speak?

Also, please help me with this if you can. I think I have seen some sentences with prepositions like "to", "in" and "at" in front of the word "where," including in questions. Would they be correct?
Comments 
Your questions are good.

I think I have seen some sentences with prepositions like "to", "in" and "at" in front of the word "where," including in questions. Would they be correct?-- I can't think of any that are correct, offhand. If you have an example, I'd like to look at it.
Anonymous I think I have seen some sentences with prepositions like "to", "in" and "at" in front of the word "where," including in questions. Would they be correct?

Yes, sometimes a preposition can precede the word "where".

A. (Up) to where did the water rise during the flood?

B. Up to here. (pointing to the top of a shrub in front of the house)

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Where should I deliver these donuts to?

To where should I deliver these donuts?

I think both of the above sound better than 'Where should I deliver these donuts?'