Starting today, you can instruct Jolly to group all the celebrations into a single message sent to your Slack channel. Prior to this change, if several people have a birthday or a work anniversary on the same day, Jolly will send an individual celebration message for every person.
Now, you can change this by clicking "Settings" within Jolly and enabling message grouping. If you have a large team, this is a great way to prevent a large number of messages from coming into your Slack channel.
If you still are not using Jolly to automate your birthday and work anniversary celebrations in Slack, now is the time to do so!