Saving up Daily Challenges

I usually dump unwanted Daily Challenges as quickly as I can, but If the game follows the recent pattern we should get a new event of some sort on Tuesday. If there are event Challenges to go with it, then it would make more sense to save up a couple of unwanted challenges - like this one I have here to collect Yoga Mats to get Yoga Mats in my #1 game, or this one to collect Lattes to get Lattes (yeah, 'cause I really want to do that...) Then I can swap them out for event Challenges and get done a little faster.
Thoughts?