Собственно, вопрос в этом самом "благополучно". Как его лучше перевести?
Спасибо!

но уточните его эмоции по этому поводу - может там окажется luckily или fortunately или happily или что-то еще

"Aah, another day, another missed performance.", как вариант.

If he's blaming s.o./sth else for preventing him seeing the concert, you can say 'Thanks to x, I managed to miss the concert'.

'I was so lucky to miss the concert' would simply mean that either the guy didn't want to go to the said concert in the first place or he feels that it was a good thing that he didn't go in retrospective. (For whatever reason - a bad weather, a lousy performance, a terrorist attack). There is no overt irony in this.
я вот так думаю.

ирония, это когда в январе вы приезжаете из Северной столицы погреться на южный курорт и подхватываете простуду. ))

На мой взгляд, "благополучно" здесь можно перевести как "predictably"
"Ну и этот концерт" показывает что не в первый раз такое происходит, верно? То есть чел имеет некую историю неудач. Можно было и не сомневаться что опять пропустит.
"благополучно" пропустил -- предсказуемо пропустил
Можно еще вспомнить"благополучно" провалил экзамен -- предсказуемо провалил (никто не сомневался что провалит)

There was a rock concert and (wouldn't you know it) I predictably missed it.

Откуда известно о роке? :) Если б был рок, он бы его так predictably не пропустил, я считаю )

Note that 'managed to' is normally used with things which are an achievement/success, as in:
* 'I managed to climb the hill' and
* 'He managed to complete the work on time'
– which is why people often use it sarcastically. It's like saying (sarcastically) 'I missed the concert. Aren't I clever?'

'Successfully (missed etc)' may be used occasionally to indicate irony/sarcasm. You can use it if you wish, but it isn't nearly as common as 'managed to (miss etc)', and the ironic/sarcastic element in it isn't nearly as obvious.

''Этот концерт я благополучно(!) пропустил'' VS ''I managed(!) to miss the concert''

They just don't produce the same effect, in my view.
And not only does ''managed' tend to (over)simplify the meaning of the original, it also implies some sort of effort, as if this individual had intended to miss the event in the first place, which is not the case at all, is it? His problem -- as I see it -- is that there's always something getting in the way of entertainment: this time it was work. Last time it might have been sickness that prevented him from going out. Next time it will be something else. He's been plagued by bad luck, poor bugger :-) To me ''благополучно пропустил'' sounds like he knew he was gonna miss it and he'd put up with the fact that he wasn't gonna make it yet again. And there's nothing he could about it. Hence ''благополучно'', meaning it was to be expected, therefore no point in lamenting it. There is no bitterness or sarcasm in his words, not even disappointment, just a touch of irony. ''благополучно пропустил'' is a humorous, rather than sarcastic remark.
That said, 'managed to miss' might still work (albeit for lack of a better option) even though it misses so much of the original's flavor, IMHO

*** implies some sort of effort, as if this individual had intended to miss the event in the first place ***
Not really, because you could use 'managed to....' sarcastically even if the person slept all the way through the concert, or just forgot to go to it. If you use 'managed to' sarcastically, it just implies that you were stupid/disorganised/lazy enough to miss it. However, I take the rest of your points.

If, as you say, 'благополучно' here indicates that the person has a history of missing things and there's no sarcasm/irony implied, how about prefixing the phrase with one of the following'? These all indicate that (the thing) keeps happening, and so is (unfortunately) predictable:
* 'True to form, I missed the concert'.
* 'As usual, I missed the concert'
* 'As per usual, I missed the concert' (means the same as 'as usual')

If you want to show that the action's predictable and you want to add an ironic/sarcastic element, you can combine any of the above three with 'managed to':
* '(True to form/As usual/As per usual), I managed to miss the concert'.

я, например (не эгоцентрирую, а лишь опираюсь на эмпирику - больше не на что), много чего в жизни благополучно пропустил (и пропущу), однако то, что для меня "благополучно", иному может показаться как "по досадному стечению обстоятельств" - и вот поди, объясни ему иронию.

Хорошо бы еще, кто-нибудь поднял тему ехидства. Я и слова-то такого не нашел.

может быть, can't, а не can?

;-)

Why, I say - это в самую печень! Кажется, я даже слышал это от Дживса (и Вустера :), жаль, что устаревшее. Спасибо! Есть, кстати, такой перевод:

“Well, why not?” asked Don Sera. “I see no reason three noble dons shouldn’t play a game of dice wherever they like!”

Ну вот не нравится мне здесь why not. Мне казалось, что направленность немного не туда,
Почему бы тебе/вам, а не почему бы нам. Так вроде нет.

Wary, конечно. Тоже спасибо, давно подозревал. Осталось выяснить, в чем двумысленность выражения "thanks much"?

"... Sarcasm so saturates 21st-century America that according to one study of a database of telephone conversations, 23 percent of the time that the phrase “yeah, right” was used, it was uttered sarcastically. Entire phrases have almost lost their literal meanings because they are so frequently said with a sneer. “Big deal,” for example. When’s the last time someone said that to you and meant it sincerely? “My heart bleeds for you” almost always equals “Tell it to someone who cares,” and “Aren’t you special” means you aren’t. ..."
https://www.smithsonianmag.com/science-nature/the-science-of-sarcasm-yeah-right-25038/