The Final March

Hello, I'm about to DM the final chapter of rise of Tiamat, and I'm pretty much prepared for the final battle, (as prepared as I can be without going overboard.) I was wondering, however, if anyone had anything significant in their games happen during the final march, or what they had happen. I added a homebrew chapter where the armies mustered at Dragonspear castle, and during the time that took I just gave the players downtime to do as they wished. I've established that this final march would be about another month. Open to any ideas that dont make it seem like we're just skipping to the final battle.