How to pronounce“happening”in English

“From the ground, Colombo’s port does not look like much.[…] But viewed from high up in one of the growing number of skyscrapers in Sri Lanka’s capital, it is clear that something extraordinary is happening: China is creating a shipping hub just 200 miles from India’s southern tip.”

““[…]San Francisco is not exactly the most happening place, you know.””

“Every show has its hottest, most happening trends. If I were to isolate just one for hardware and one for software, this year's hot hardware would be the 386 machines, and the happening software would be desktop publishing.”

“Three follow-up singles, all ecological or religious in theme, did chart in the lower reaches of the Hot 100. Thereafter, Ocean remained a Canadian happening.”