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Capulet moves the wedding date up
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.
It was moved forward a day (from Thursday morning to Wednesday morning). This meant that the Friar had to rely on a letter to tell Romeo of Juliet's fake death.
Friar Lawrence had a schedule set up whereby Juliet would take the potion Wednesday night and wake up 42 hours later for Romeo to come and get her, sometime Friday night. Presumably he sent Friar John with that message. But when Capulet set the wedding for Wednesday morning, Juliet had to take the potion on Tuesday night, a day earlier. So it didn't matter that Friar John's message did not get through because Romeo would have come a day too late anyway. However, for some reason, the friar does not seem to be worried that Romeo is not going to be warned to come Thursday to get Juliet.
Capulet inexplicably advances the wedding of Juliet to Paris from Thursday to Wednesday. He does this late Tuesday night.
Thursday, originally, then brought forward to Wednesday.
Capulet arranges for the wedding between Juliet and Paris to take place sooner than originally planned.
On Tuesday night he changes the wedding date from Thursday morning to Wednesday morning, effectively giving nobody a chance to prepare for it, and probably likely to disappoint everyone ready to come on Thursday, who couldn't be notified of the change. Oh, well, they got to go to the funeral instead.
Thursday, then Wednesday.
He thinks it would look bad to have a large party given Tybalt's death. It would look as if they were not giving him the proper respect. Also when you decide Wednesday night to have a wedding on Thursday morning, you don't have time to make complicated arrangements.
Juliet was at first supposed to drink the potion on Wednesday night because the wedding was supposed to be Thursday. Of course they then put the wedding up to Wednesday, so she had to drink it Tuesday night.
Thursday. "On Thursday next, at St. Peter's church the gallant county Paris shall make you a joyful bride."