Both pre and post acquisition. I always had the support of Eventful CTO Chuck Norris (who is great to work for). Support from the business side varied over time. I got around that to a certain degree by scheduling most study sessions over lunch break and providing lunch.
I also had strong support from the rest of the Eventful engineering team. Before leading the beginner study groups, I'd already been leading engineering study groups for years. Some of that overlapped with open source community study groups: https://wiki.apache.org/lucy/LucyBookClub