This is tricky.
On the weekdays of Easter, votive Masses are “forbidden
per se” however, it is at the discretion of the pastor to allow a votive Mass if he has a very good reason.
Based on how you phrased the question “we’d like to have a Marian theme…” it doesn’t sound like there’s a particular reason…
so I’ll ask “what is the reason for it?”
Here’s an example of what I mean.
April 17. Votive Masses are forbidden.
On that day, the parish has a special event honoring mothers, an appreciation dinner for all mothers in the parish.
The pastor celebrates Mass for the parish before the dinner honoring mothers.
If he decides to use the votive Mass “the Motherhood of BVM” * I think that would be just fine. He can allow it because he has a good reason for it.
On the other hand, if it’s just a matter of saying “what Mass should we choose for that day?” and someone says “how about a votive Mass of the BVM?” it would be a no.
- I havent’ seen the new Missal yet, so I don’t know how the votive Masses have been named. I’m only using that as an example.