It's possible they might do something, but probably not anything huge.
The difference is, when an airline launches a new route, it's the airline doing it. New hotel opens, it's usually (but not always) just some random company opening a hotel that happens to say marriott on it.
Is it a brand new construction hotel, from ground up, or is the property just being reflagged as a Marriott RI? If 'special' means promotion, balloons, and so on, that will likely happen. If 'special' means greatly reduced room rates during opening, that *might* happen, especially if it is a brand new property and the initial opening is a soft one, with perhaps not everything completed at that time.
And I'd say that most Marriott properties, but not all, are owned by franchisees, and not by Marriott proper, which is what Jsucool76 likely means by 'random companies'.
Your best bet is to call the property or their ownership and ask them what they are doing.
Agreed - you need to reach out to the management company to learn about any special events going on.
I had a family member stay the first night at a hotel and at the hotel's request, they had their picture taken with the team and were declared the "first guest." They actually were not aware that they were going to be the first guest until they arrived. It was a neat opportunity and I hope to have the same experience someday.