Kenn Nesbitt's Poetry 4 Kids website has a list of 10 ideas for celebrating Poem in Your Pocket Day. Kenn Nesbitt is a former Children's Poet Laureate. (He mentions the day as April 24 because the date has moved over the years).
The League of Canadian Poets encourages all Canadians to be part of Poem in Your Pocket Day. They have some suggestions for activities, links to poems by Canadian poets and illustrations to print out if you'd like to carry a "poet" in your pocket.