Title says it all. Pray let us toggle the EXP share during events.
If justification is needed, I know I am in a minority among the p*kémon playerbase for utterly despising party-wide EXP shares. To me, they throw the entire game balance way out of whack. As evidenced by my run so far here, started yesterday during the ongoing summer event. Just beat Lt. Surge. I seem to have outlevelled him by 10+, in a full party of six. Threw my garbage Xatu at him and pressed nothing but the Air Slash button. And it still was nowhere near close. Bit stupid, isn't it.
This is fun for exactly five minutes before it starts being depressing and ends up with me skipping four out of five trainers in the wild to keep my EXP down. Could play like it's SV and raise five teams or more to avoid being overlevelled, but I don't think I could scrounge together enough mons I like to do that so early in the game.