[MENTION=6858221]Kalaron[/MENTION]: Thanks for posting your thoughts anyway, even if they were too late.
Here's what my group ended up doing last night: They decided to go back to Krezk to see if they could convince the abbot to raise Ismark from the dead. I had Strahd's carriage waiting for them at the crossroads but they ignored it, so they were met with two (randomly rolled) dire wolves. They proved to be no match for three 6th level PCs (we were down a player).
Back in Krezk, the abbot agreed to raise Ismark provided they found him a wedding dress for Vasilka first. They went and got the sunsword from the abbey garden and fought off the scarecrows, but only just barely, so they ditched the idea of going to Vallaki for the festival and spent the night in the Krezkovs' house. (I also had Ilya, whom the abbot had raised during the previous session, run off ... his madness was the paranoia one, and I'd read something similar elsewhere as a hook for the werewolf den.)
I decided to have Strahd pay the PCs a visit during the night. I rolled randomly to determine who was on watch at the time and got the fighter who happened to have the sword hilt on him. Strahd charmed him and got him to come outside and bit him, knocking him out but not killing him. The player then asked me if Strahd had looted his body ... so I asked if he'd had the sword on him at the time, and when he said yes, I grinned very evilly and said yes, the sword was gone, but that was the only thing Strahd had taken. He's now sure that that was my plan all along but I actually didn't think of it until he asked.
I'm thinking of having Strahd take the sword to the werewolf den, as I like the idea of the PCs having to suffer Mother Night's curse to get the sword back.
Anyway, after that, they decided to head for Vallaki. They found the carriage waiting at the crossroads again, and one of the players was adamant they should get in. The other two were equally adamant that they shouldn't, so there was a bit of back and forth before they eventually decided to go to Argynvostholt instead!
They were met with four more dire wolves that also proved to be no match for the PCs.
At Argynvostholt, I did the Vistana with the coffin. The PC whose name was on it opened it and got surrounded by the bat swarm, but the other two PCs killed it before it could even get one set of bites in. Boo!
In the mansion, they decided it would be best to head up to the top and then work their way back down, so they pretty much went straight to Vladimir and Sir Godfrey. They got nowhere with Vladimir, but they learned about the history of the place from Sir Godfrey, who told them he would help them if they lay Argynvost's spirit to rest first by retrieving his remains from Castle Ravenloft and interring them in the mausoleum.
As per the text, this decision of Sir Godfrey's angered the other four revenants in the room and they rose up to attack. That is where we ended the session.
One thing I'm not sure about, though: it just says that it incurs the other revenants' wrath and provokes an "armed conflict". I'm not entirely sure what this means. Would they focus their attacks on Sir Godfrey, or would they also attack the PCs?
As for Vallaki, if they do eventually make it there, it could end up being a very different place. It's a little unclear when the attack on the church is meant to happen - possibly the night of the festival or the night after. It also says that the villagers don't attack the baron and burn his house down until a few days after the attack on the church, so I guess some of this stuff might not have happened yet by the time the PCs get there. But if they take too long, they'll find Lady Wachter in charge instead of the baron.