The regiment reaches its full quota of 1,000 men today, and the overflow is used to start the 55th Massachusetts Volunteer Infantry.
A letter from Shaw to his father:

Readville [BCF]
May 11,1863

Dear Father,

I received your note, acknowledging my last from Lenox, this morning. Annie and I got to Boston, Saturday evening; coming the last part of the way with Mrs. Haggerty and Clem., having met them at Springfield. I found the regiment looking remarkably well; there are already one hundred men for the Fifty-fifth. Both the Hallowells refused the Colonelcy of it; but the Governor says Norwood must stay and help organize it, whether he wishes to or not; so he will be detailed by the War Department. I hope Mother and you will come on very soon. We shall get away next week without a doubt, if nothing unexpected turns up. General Wilde goes to New York Wednesday, and sails for Newbern on Friday.

We are settled at Mrs. Crehore’s, and ready to receive you whenever you can come. By this time, there must be some news from the coming baby.

Love to Mother and Nellie. I received Mother’s note at Lenox.

Your loving Son

NYTimes archive links:
[1863-05-11] Baptism of a Slave Child.; AFFECTING EPISODE AT PLYMOUTH CHURCH.
[1863-05-11] Movements of Massachusetts Troops.