Back story: Our October wedding is kind of "destination" since it's at least 2 hours away for everyone - including us. We've reserved room blocks at 3 hotels that are walking distance to the downtown areas: 40 rooms at one hotel, 30 at another, and then 10 at a nicer hotel. We included the info on the website as well as the Save-the Dates that we sent out around Thanksgiving. We also emphasized that there will be a convention in town that weekend, as well as other weddings (October is the 2nd or 3rd most popular month for weddings in this city) so guests should book well in advance, especially if they already know that they can come (barring any unforeseen circumstances, of course)...
The "issue": Earlier this week I got a call from the hotel with the 40 room block saying that we will not be able to add any more rooms cause the rest of the hotel is now booked up (we had started with a block of 15 and added in groups of 5 or 10 when needed). The hotel with the 30 room block had told us from the beginning that they could not offer more than the 30 at the discount rate. These 2 hotels have been more "popular" with our guests than the third hotel cause they're rates are about $50-$75 cheaper than the third hotel.
Both of these larger blocks now have less than 10 rooms left, combined. My FMIL thinks that we should contact everyone who has not yet made a reservation, to give them a heads up that the room blocks are almost filled. My mom thinks that we've done more than enough by reserving 3 blocks, and since we also mentioned that there are dozens of bed&breakfasts in the immediate downtown area, and listed some of the nicer inexpensive ones on the website. Also, she's in the mind that especially since we had advised booking early, our guests are grown ups and can figure out finding a place to stay on their own. I feel like a heads up email would be nice so no one gets a surprise if they call and find that there are no more rooms available in the blocks, but at the same time I don't want to feel like we're pressuring them to book "now now now!" since the wedding is still 7 months off...
(for a frame of reference, the number of people/units/families that haven't booked yet could easily equal 50 more hotel rooms if most of the people RSVP 'yes,' which I know is realistically not going to happen...)