Hayden Panettiere cancels her scheduled Creep I.E. Con appearance in Ontario, California, because of an unspecified emergency and organizers say Dominique Swain will replace her.Tori Spelling cancels a separate appearance hours earlier, forcing reshuffles to autograph and photo sessions and prompting some refunds after both notices were posted on Instagram with no further explanation.Hayden Panettiere, 36, who published the memoir "
This Is Me: A Reckoning" earlier this year, had been due to appear with "
Scream 4" co-star
Nico Tortorella; other guests such as
Christina Ricci have rescheduled but the convention continues as planned.