Thanks for the responses.
I just thought it was odd seeing our traffic have a 10% increase Friday, followed by a 10-15% decrease Sat and Sun. These are not differences from day to day, but Saturday compared to the last 5 Saturdays. Same for Friday and Sunday, with comparisons to the same day from the past month or so. Seems to be coming back to normal today, so it must have been a mothers day weekend drop.