wǒ / zhǐ shì / tí xǐng / dà jiā / bié / zài / kāi yè / dāng tiān / shuō / huì qì huà / miǎn de / chù méi tóu

我只是提醒大家别在开业当天说晦气话，免得触霉头。

I was only reminding everyone not to say anything unlucky on the opening day, so we would not bring bad luck upon ourselves.