“本来6号来，由于开会，推迟到8号”用英语怎么说？

I planned to go to your plance on 6th, (哪个月)，however, there is a very important meeting for me to attend, so I have to put it off to 8th.

推迟用put off
Put off the meeting till Saturday.
把会议推迟到星期六。

或者用postpone
He postponed the meeting to tomorrow.
他将会议推迟到明天。

In my schedule,I will meet you on 5th, but there is an very important meeting I have to attend, I have to put off to 8th to meet you. Please kindly forgive.

译文：
"I was on the 6th to you there in the past, but there must be a very important part in the meeting, it had to be postponed until 8 to be, understanding."

I was on the 6th to you there in the past, but there must be a very important part in the meeting, it had to be postponed until 8 to go, understanding。

I'd planned to meet you at 6th,but I have to put the date off to 8th because of a very important meeting I must attend. Thanks for your consideration.

I planned to go to your plance