Yeah, that's acceptable. Although the 'event' here is just a trip to the market/meeting someone, you can use
waktu itu to refer to it because it's already completed. However, although it’s ‘acceptable’, there are better ways to structure a question like this.
Waktu itu is a great way to start a question if you and the person you are talking to both know what time/place is being referred to. It is especially common to use
waktu itu at the start of questions addressed to somebody who is narrating their life story/an incident from their past/talking about “back in the day”. I used to use it a lot to ask open-ended questions during interviews (i.e.
waktu itu how did you feel/what was it like etc.). For example, if your missus had been talking about the ups and downs of her former career as a dolphin trainer, you could definitely ask something like “
waktu itu jadi dolphin trainer itu kayak apa sih sebenarnya?” However, if you were just sitting at home watching Indosiar and decided to ask “
waktu itu jadi dolphin trainer itu kayak apa sih sebenarnya?”, she might be a little confused. Flattered that you want to know more about her past, but nonetheless confused
This is why your question sounds a little unnatural – not really wrong, just slightly “off”. In your question, you have to explain what
waktu itu is actually referring to (the trip to the market). If you want to ask something OOT in Indonesian, it is more natural and common to say something like "(
kamu) inget ngga waktu kita ke pasar dan ketemu ama bu Tiyem?" or "
inget ngga ama bu Tiyem yang kita ketemu di pasar waktu itu?" or even
"pas lagi di pasar, kita ketemu ama bu Tiyem... inget ngga?"
If you are still determined to use
waktu itu to start your question, you could say something like "
kamu ingat ngga waktu itu di pasar kita ketemu sama bu Tiyem?" This is an improvement because
waktu itu is followed by the description of what
waktu itu is actually referring to. But it is still not the most natural choice.
Last point
waktu itu sometimes pops up in questions as a “stalling device”, e.g. somebody has started to ask a question then forgotten what they wanted to ask. Example “
kamu inget ngga sih sama si ibu itu yang… yang kita ketemu… waktu kita… ee… waktu itu tuh, pas lagi nyari baju di.. ee apa sih namanya…. aduh gue lupa…. di … di pasar!!” I should probably stop typing now, this is already another monster response, hopefully useful.
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