Sri Sri Jagadguru Shankaracharya Mahasamsthanam, Dakshinamanaya Sri Sharada Peetham, Sringeri

Should one be physically present at Sringeri to perform any Seva ?

Although it is not necessary for a Devotee to be physically present for performing the Seva, it is always suggested to perform the Seva by visiting Sringeri in person, have the Darshan of Goddess Sri Sharadamba and get the Blessings of His Holiness.

However for performing Aksharabhayasa (Vidhyaramba) for the child the devotee is required to be present alongwith the Child.

To that which is born, death is indeed certain; and to that which is dead, birth is certain. Therefore, knowing this, you ought not to grieve over (this) inevitable. Bhagavan Sri Krishna on Significance of God
Daylight and darkness, dusk and dawn, winter and springtime come and go. Time plays and life ebbs away. But the current of desire never leaves. Jagadguru Sri Adi Shankara Bhagavatpada on Mohamudgara
Once you begin to feel the presence of God, a joy unknown to you ever before will begin to be felt. The thought of his ever- living presence with you will be a great solace to you. Jagadguru Sri Chandrashekhara Bharati Mahaswamigal on Significance of God
Tendencies develop, regardless of the characteristic of the action performed. Hence, he who wishes to lead a proper life will do well to avoid evil deeds and to repeatedly perform virtuous deeds. Jagadguru Sri Abhinava Vidyatirtha Mahaswamigal on Significance of God
To err is human. Accepting one’s error and correcting oneself is a mark of nobility. Humility is the primary path to achieving nobility. Jagadguru Sri Bharati Tirtha Mahaswamigal on Significance of God's Names