Take your journal everywhere!

I take my sketchbook/journal everywhere with me.
To school visits.
To field trips.
To family vacations.
To any place where I think I'll have to stand in line for a while.
To my kid's (and grandkids') sports events and concerts and award ceremonies.
To weddings, births, funerals, parties.
Even to church.
I used to be squeamish about that. I'd get my priest to bless each new journal, figuring that was his tacit permission to sketch during Mass.
I'm not squeamish about it anymore. One of the priests brings his journal to Mass! And the children in our church's school are encouraged to bring theirs.
Often a kid in church will recognize me (from a school visit, or because I donate art to the religious education program). I try not to be conspicuous -- I don't want parents to think I'm a bad role model.
Writing and drawing during Mass helps me to remember the important things (and some trivial stuff too).