Zax37

Date: select first date
StartOfDateWeek: fromTimestamp(timestamp(prop("Date")) - (((day(prop("Date")) == 0) ? 7 : ((day(prop("Date")) - 1) * 24 + toNumber(formatDate(prop("Date"), "H")))) * 60 + toNumber(formatDate(prop("Date"), "m"))) * 60 * 1000)
WeeksFromOriginal: ceil(dateBetween(now(), prop("Date"), "days") / 7)
NearestDate: dateAdd(prop("Date"), prop("WeeksFromOriginal"), "weeks")

Whenever it's 24 hours from last event, NearestDate should update to same + 7 days.