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Lizard still hasn't answered what he intends to do with players who have the desire and opportunity to compete in both nominations. Therefore, I suggest the following option, which seems to solve the problems:
2 tournaments are held - one for VT, one for SoD. Players can participate in either one of them or both.
The VT tournament starts 3 days earlier. That is, the SoD tournament begins simultaneously with the 4th round of the VT tournament.
Players who reach the 4th round of the VT tournament receive a freewin in the 1st round of the SoD tournament, while others begin playing the 1st round.
Regarding the dates - May 1 2014 is a Thursday, meaning official holidays will likely be from the 1st to the 3rd (Sunday being a working day). Therefore, the optimal dates for own holding are from April 26 (Saturday) to May 3 (Saturday), which means that participating in both tournaments would require time off for 3 working days (28-29-30).
I checked the train schedule - there are daily night trains from St. Petersburg, Moscow, and Kyiv arriving around 9-10 AM, which, provided there are no logistical problems, will make it possible to play the first round on the day of arrival.
Regarding the number of players - for the VT tournament, it is preferable to have no more than 16 players so that the tournament is guaranteed to end in 4 rounds, without the ghosts of a 5th round as happened all previous times. Accordingly, in the SoD tournament, due to freewins (8 pcs.), we will have to aim for 5 rounds. In total, that makes 8 rounds (one combined). It seems possible to fit within the timeframe.