在方便的时间或地点 at one's convenience (=where and when it suits one ); at one’s convenience (=where and when it suits one ); at one’s convenience(=where and when it suits one)
I hereby convene three forums to discuss the subject . principals , teachers , parents , alumni and faithful in general may choose the time and venue most suitable to them and come to these sharing sessions . a booklet containing the compilation of what i have written on the subject will be distributed to the participants 我在此召开下列三次座谈会,欢迎教会学校的校长老师家长旧生及教友大众拣自己方便的时间或地点来真情对话,届时也会将本人已发表过的言论小册子派给大家。