Hi, I am not sure whether it is correct to say "go out for a wedding dinner", though going out for a beer is correct... I'd like to point a tense mistake that you've made. If you say the guy was alone, then his parents must have left the house earlier, so I think the Past Perfect tense works better: «He was alone in the house.
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Vincent Teo
(a) He wasathome alone. His parents went outforto a wedding dinner/a wedding reception.
(b) He was alone in the house. His parents were attendingattended for / toa wedding dinner/a wedding reception.