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> 20日過ぎに海行くんだ

I'm pretty sure this means

> going to the sea in 20 days

but 過ぎる signifies elapsed time, so could it possibly be

> going to the beach **for** 20 days

?
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2018-11-29T03:46:27.090
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words
Meaning of 過ぎ in 20日過ぎに海行くんだ
「～～過ぎ」 can mean "past~~" "after~~".

Examples from
[プログレッシブ和英中辞典](https://dictionary.goo.ne.jp/word/en/%E3%81%99%E3%81%8E/#je-38846):

> 20日過ぎに (sometime) after the twentieth  
>  8時過ぎに電話してね Call me after eight.
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2018-11-29T04:19:03.350
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Of course @Chocolate has already given the [correct
answer](https://japanese.stackexchange.com/a/63103/1628), but let me just note
that the meaning of 過ぎる of "elapsing time" that you mentioned is correct,
although I would rather think of it as _passing_ a particular point in time
(or _exceeding_ a particular fixed period of time).

> 8時過ぎに電話してください = 8時が過ぎたら電話してください  
>  Please call me after 8 o'clock = Please call me when 8 o'clock has passed

Here it refers passing a particular point in time (8 o'clock); similarly the
transitive 過ごす can also be used for passing a physical location, as for
example in 乗り過ごす (see ["Norikosu" vs.
"Norisugosu"](https://japanese.stackexchange.com/q/60888/1628)).
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