Why was Booth admitted into the presidential box?

[Tom Bogar]

[quote='L Verge' pid='46728' dateline='1429376743']

This question is for Tom Bogar: Did they have ushers at Ford's Theatre?

Laurie,

They did, but the ushers had all been sent home at the start of Act III, since their services were no longer needed (lucky them). They were:
Mr. Gildour, family circle usher
Alphonso J. Houck, Ford’s business partner and part owner,also bill poster
James R. O’Bryon, Chief usher of the dress circle
James H. St. Clair, pit/parquette usher
Henry Sauder, upstairs (third tier) doorkeeper
Edmund E. Schreiner, dress circle usher