https://www.youtube.com/watch?v=HtfQ4LItIUcFran Finney, Hal's wife, has launched a "Running Bitcoin" challenge (named after Hal's famous tweet:
https://twitter.com/halfin/status/1110302988) running up to January 10th, the anniversary of the famous tweet. The challenge is to run a half marathon (21.1 km, 13.1 miles), raise some sponsorship, and donate some bitcoin in Hal's name to ALS research. You can receive a few cool bitcoin/Hal themed items in return if you hit certain goals, and you don't need to do the full half marathon in one go - just cover the distance over the next week.
Unfortunately the website -
https://runningbitcoin.us - seems to be down at the moment, but a snapshot on the Wayback Machine forwards you to this page -
http://web.alsa.org/site/TR?team_id=400870&fr_id=14584&pg=team - which is the Running Bitcoin team page on the ALS Association website. You can also see some individuals' progress at
https://mobile.twitter.com/bitcoinrunners. Even if you can't run, you can throw some bitcoin their way in honor of Hal. Looks like they've already raised over their initial goal of $5,000.
I have no links to this charity and cannot vouch for it one way or another.