YOU SAID:

I have a feeling that they are not going on this Sunday

INTO JAPANESE

私は彼らがこの日曜日に行っていないと感じています

BACK INTO ENGLISH

I feel they didn't go this Sunday

INTO JAPANESE

私は彼らがこの日曜日に行かなかったと感じます

BACK INTO ENGLISH

I feel they didn't go this Sunday