You can remind yourself or you can ask with the help of your neighbour. Halloween is coming so be energetic.
Halloween is an annual holiday celebrated each year on October 31, and Halloween 2019 occurs on Thursday, October 31. It originated with the ancient Celtic festival of Samhain, when people would light bonfires and wear costumes to ward off ghosts. In the eighth century, Pope Gregory III designated November 1 as a time to honor all saints; soon, All Saints Day incorporated some of the traditions of Samhain.