We plan far in advance for EVERYTHING. Crafts must be submitted at least 6 months in advance. All print materials must be submitted at least 4 months in advance. If something is submitted after this timeline, we MAY be able to include it in our weekly e-mail blasts, or use the idea for a different day than intended, but in general we have to plan far in advance!
You can see the advance readings on the USCCB website: http://www.usccb.org/bible/readings/011818.cfm