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I doubt the literal equivalent 臨界量 is likely to work here.

I'm speaking in the sense of a community activity, where a critical mass of
people is required in order for it to survive. e.g. if a group of 10 people
meet weekly to do something (e.g. playing poker, going hiking, etc.) it's
likely to continue to happen, while if only 2-3 people are interested it's
likely that the desire to continue will disappear and it becomes difficult to
encourage new people to join.

Is there something similar I could use to refer to this concept?
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2017-09-16T21:15:45.773
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2017-09-17T05:54:01.507
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question
idioms
Is there a phrase/idiom similar to 'critical mass'?
クリティカルマス or クリティカル・マス is widely used as marketing jargon, but this only refers
to a nationwide market share of a new product/service. When describing smaller
community activities, I don't think there is a good and short phrase. Some
ways to rephrase it would be:

  * 持続可能な最低限の人数 (lit. "minimum sustainable number of people")
  * 次回以降に安定して続けていける人数
  * 次からもやれそうなだけの人数

臨界質量 and 臨界量 don't work in this context.
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2017-09-17T02:01:41.730
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answer
We don't have a portable word specifically for your situation. You can refer
to @naruto's suggested phrases if you want to use it independently, or reword
to:

> [what you want to do] を続けていけるだけの人数

Of course, that doesn't translate every "critical mass" regarding people other
than the context you explained.

I also found a few usage of 臨界人数 at Google, but I'm not sure if it'll gain
popularity (at lease not by now).
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answer