The Summer Solstice Carnival were not banned because of the plague and fire. I think its just a case of staff having been especially busy to orchestrate plots relating to it. And ic speaking, they dont always come to Hogsmeade, if I remember correctly since theyre a traveling carnival (staff would know better than I though, thats just been my working assumption).
From the time line July 1888: Having been delayed by the fog the Summer Solstice Fesitval belatedly returns to Hogsmeade for the first time since the Laughing Plague in 1884.
And with the flying ban in place, a flying event could be some disgruntled sponsors protest against it. Since they wouldn't be able to do it in Hogsmeade, they could do it at the Sanditon (since Irvingly has no magic in public laws and broom race around town would be pushing it.) though that might be seen as in poor taste since Sloane died over water.
From the time line July 1888: Having been delayed by the fog the Summer Solstice Fesitval belatedly returns to Hogsmeade for the first time since the Laughing Plague in 1884.
And with the flying ban in place, a flying event could be some disgruntled sponsors protest against it. Since they wouldn't be able to do it in Hogsmeade, they could do it at the Sanditon (since Irvingly has no magic in public laws and broom race around town would be pushing it.) though that might be seen as in poor taste since Sloane died over water.