Theory:

     “There is no misery about it,” Miss Beam continued. “Everyone is very kind, and it is really something of a game. Before the day is over, though, even the most thoughtless child realises what misfortune is.

     “The blind day is, of course, really the worst, but some of the children tell me that the dumb day is the most difficult. We cannot bandage the children’s mouths, so they really have to exercise their will-power. Come into the garden and see for yourself how the children feel about it.”
Explanation:
  
Miss Beam continues to talk about the system. She says that there are no difficulties in the system. The students are kind, and they find it exciting. It is like a game to them.

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The special days are like a game to them

However, to Miss Beam, it is not merely a game. By the end of the day, even the most careless or uncaring child will learn to understand the problems of disabled people.

Miss Beam then talks about responses given by the students. She says that the students find the blind days difficult because they will have to live a day without seeing anything.
 
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Blind day is difficult because they cannot see anything for the entire day
 
But some students say that being dumb is more complicated than anything. It is so because the students are unable to remain mute after a certain point of time and, as opposed to the "blind day", their mouths are not bandaged. The children will have to be determined to make the most of the dumb day.
 
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Dumb day is difficult because the mouth of the students cannot be covered

Later, Miss Beam invites the narrator to the garden and asks him to find out how the children feel about the special days.
 
Meanings of the difficult words:
  
Sl. No.
Words
Meanings
1
MiseryDifficulty; problem; sadness
2
Something of a gameSomething interesting or exciting
3
ThoughtlessCareless; uncaring
4
Bandage
Cloth to cover a wound; a strip of woven material used to bind up a wound or to protect an injured part of the body
5
Will-powerWill; determination
6
Exercise their will-powerUse their will-power
Reference:
National Council of Educational Research and Training (2006). Honeysuckle. A Different Kind of School - E. V. Lucas (pp. 56-62). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.