Beijing to Tianjin during National Holiday

Hi
My wife and I are travelling to China. Towards the end of our trip we will be in Beijing. Our return flight is from Tianjin at 9am on October 1. I have read that its national holidays.
Will I be able to get a train on the morning of October 1 from Beijing to Tianjin that will get me to the Tianjin airport by 7.30am? This is considering the everyone might be travelling on that day and taking traffic into account.
Also, where can I find if there will be more trains during this time and where can I book it?