Apparently it could. It's not that hard if you don't care whether you have any guests and you have a staff of servants to make a big meal on a moment's notice. All you need is an obliging officiant and a bridegroom who is in the loop.
Capulet does exactly this. He decides that the wedding scheduled for Thursday should take place Wednesday morning. He makes this decision late on Tuesday.
He changed the date of the wedding to a day earlier.
He decides to have the wedding a day earlier before Juliet changes her mind.
The father, because he is the one who had organised the marriage at first between Paris and Juliet, he makes the desicions in the Capulet household and he is the person who moves the date of the wedding one day earlier. He is also forcing Juliet to be married because in one of the scenes Juliet disagrees in marrying Paris and Lord Capulet says that if she were not to marry him he will disown her. So he also threatens her to marry Paris.
The plan for Paris and Juliet to get married is disrupted when Juliet fakes her own death to avoid marrying Paris and be with Romeo instead. This deception ultimately leads to tragic consequences for the young lovers.
Paris believes Juliet is going to confessions for the wedding.
he moves Juliet's wedding with Paris forward
Paris is there, arranging his wedding to Juliet.
Lord Capulet supervised the plans for Juliet and Paris's wedding. The wedding was originally on a Thursday, but Lord Capulet moved the wedding to a Wednesday.
he has the wedding between Juliet and Paris be sooner
A wedding. Capulet and Paris have agreed between them that Juliet will marry Paris. Mrs. Capulet happily announces that on Thursday next at St. Peter's church, Paris will make her a joyful bride. Nobody asks Juliet how she feels about all this.
She swore to kill herself
No. Juliet 'dies' the night before the wedding.