which verb tense is used to express what usually happens?
e.g. usually flamenco dancing is performed in cafés?
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For that sentence you would use the present tense of "interpretarse", which means "to be performed".
"El baile flamenco suele interpretarse en cafés" or "El baile flamenco tipicamente se interpreta en cafés"
In answer to your question, the verb is "soler" which means as follws,
To be in the habit of
To tend to
mountaingirl has used the verb in one of her examples.
I suppose another verb could be "acostumbrar"