Hi Linda,
Great question!
I’m afraid that – right at this time – that isn’t readily possible though we are investigating some avenues to make it happen, so keep an eye on our blog as we’ll certainly post about this feature once it’s available 🙂
In some cases you can workaround this with a little creativity, for instance you could create a weekly or custom pattern that covers all of the target dates (and more) and then selectively delete the ones you don’t want – however in some cases, perhaps including the very irregular pattern you used as an example, that may not be a very practical way to go.
In any case, I hope that answers your question and do know this is something we’re very interested in implementing in a future release.
Thanks again!