Format and people forget
I think too many tasks at one time is overwhelming. Rather we try to send out weekly posts with e.g. five things you can do this week to help build a smashing lote: 1 sentence summaries and urls to the page where people can complete the task, ideally a post or wiki on edgeryders platform.
Also with so much going on, we often need to be reminded. So focus on 5 tasks per week and we can push them out via social media channels etc.