Last post had the wrong date. Split happens August 30, tonight.
Everything else is the same, just the date was wrong! Original email reproduced below with corrections.
I'm buying 1 share of $ACST by market close on Aug 30, 2021. 1:8 ratio reverse split rounding up fractional shares overnight. For participating brokers and sources, see: https://www.reversesplitarbitrage.com/splits