some time ago; the other day
先般ご連絡した件です。
This is regarding the matter I contacted you about the other day.
先般送付した書類をご確認ください。
Please check the documents I sent the other day.
先般開催した研修会の参加者から好評の声が多く届いた。
Many favorable comments came in from participants of the training session held the other day.