9pm is our second show start time. our second show starts 9pm"
"9pm is the time our second show begins".
"our second show begins at 9pm"
"our 9pm show is second"
You may check here https://www.quora.com/Which-sentence-is-grammatically-correct-A-Our-second-show-starts-9-PM-B-Our-second-show-begins-at-9-PM-answer-with-explanation-pls