Which preposition to use with ascot

in Occurrences 1%

We may have the Council at 10, and he may be at Ascot in excellent time.

on Occurrences 1%

I owe my determination never to play again at cards to the bad luck which befell me on a particular occasion at Ascot on the Cup Day of the year 18.

to Occurrences 1%

"Somehow I don't feel quite in the humour for Ascot to-day.

with Occurrences 1%

Besides, I have promised the Princess of Thurm that I will go to Ascot with her.

without Occurrences 1%

We progressed amicably from oysters and soup down to coffee, cigars, and liqueurs, and I succeeded in swallowing Kennedy's tales of Monte Carlo and Ostend and Ascot without even a smile.

Which preposition to use with  ascot