I looked into it a bit: The Sarek was conducting wargames in 2312.Q3 and Q4 and didn't get any other EC event (at the end of Q4 she was called away for dealing with the Celos crisis, but the Q3 post makes clear that the wargames would have consumed the normal Q4 event anyway). The wargames we voted for in 2313 seems to have been conducted in the first half of 2314 and neither the Selnas nor the Blizzard had any other events in Q1/Q2, which is mildly unusual, they are pretty regular responders and gaps usually correspond to things like the Salnas being damaged and needing repairs or the Blizzard being part of a convoy. Either of them lacking any events in that time frame wouldn't say anything, both of them at the same time is suggestive.
The wargames voted for in 2314 were conducted by forces that were already gathered anyway and waiting for the break out of hostilities with the Licori so they don't say anything either way.
The wargames voted for in 2315 involved member ships and wouldn't have any impact on our responders.