卒業式は三月二十日に行われます。

tbd

The graduation ceremony will take place on March 20th.

私は二十日までに帰るつもりです。

tbd

I expect to be back by the 20th.

ＡＢＣ社のガードナー氏は、２月２０日から２７日までマリオットホテルに滞在中で、ぜひあなたに会いたいとのことです。

tbd

Mr Gardner of ABC Corporation is staying at the Marriott Hotel between 20–27 February, and would like very much to meet you.

Mr. Gardner of the ABC Corporation is staying at the Marriott Hotel from February 20th to the 27th, and would like very much to meet with you.

２０日と２１日の午後を空けてありますので、この２日間のいずれかにグラント様とお会いしたいと考えています。

tbd

I have kept available the afternoon of the 20th and the 21st, and would like to know if Mr Grant will be available for a meeting on either of those two days.