Let's meet at the trailhead at 9am. Those who would like to carpool can plan ahead to do so. From Washington Trails Association site, here are all the details on how to get there and what you can expect:
https://www.wta.org/go-hiking/hikes/talapus-and-olallie-lakes
Let's not plan to eat together at any restaurant afterwards, rather be sure to have your daypack with water and food you'll need for the hike.
For those comfortable doing so, once we are at the lake, a dip to cool off from our hike could be refreshing.