I put things like this on my Yahoo calendar and program them to send me reminders on my preference. Like the Easter Egg Hunt they had today. I put it in as soon as the note came home. Then I set the reminder for 2 days ahead, 1 day ahead, then put another calendar event in for the same thing but it reminded me 24 hours ahead and then again for 12 hours ahead. I was at Walmart last night at 8pm getting him a basket/bucket and a dozed pre-filled eggs with peace signs and stars on them.
Then I left them in the car in the front seat so I wouldn't forget them this morning...lol.
The girl had one too but did not bring the note home. I did call her school though and was told they were not having anything in her age group. She came home crying, she was the only one that did not bring anything.
It is sad but you need to find a way to be more organized. ONLY USE ONE ELECTRONIC CALENDAR. Or you could find you can't find a date for anything.
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An option we did before smart phones was buy monthly calendars at a local business supply store. Then I wrote each thing on the calendar with a colored marker for that color child. The girls favorite color used to be orange so all her activities were circled in orange, his has always been red. I used stickers for different stuff too.
A permanent calendar, individual, bought separately and can be used for any month. This way they can't be erased, dropped in water, etc...nothing can mess them up if they are in a good area.
I would use old style school stickers on each day they had school so I would not have to keep up with the school calendar they send home the first of school. I put soccer ball stickers on soccer practice days with the time written beside, and circled with the color needed. I used all sorts of stickers from Hobby Lobby, baseballs for T-Ball, a gymnast for gym and tumbling, a ballerina for dance, hearts for church, rainbows for something, I don't know, I have drawers of them and I still have several years of these individual calendars. They fit on the lower front of my fridge that had the freezer on the top.
I got used to looking at it and knowing who had something coming up that week that I needed to take care of. It helps to have visual reminders. I got a different style fridge and the calendars like this don't work now. I use a smaller version of that style and have it on the wall outside my bathroom in front of the washer and dryer. That way it is in the main walking area of the home and I see it numerous times of the day.