Foul weather, a group leader’s illness, insufficient sign-ups — many situations can cancel or cause schedule changes for events and outings. To be certain of your plans, always check before you go.

Correction: The North Seattle Lapidary & Mineral Club’s 66th Annual Rock and Gem Show will take place from Saturday, Feb. 29 to Sunday, March 1, not Saturday, Feb. 22 and Sunday, Feb. 23 as reported in the Friday Datebook listing.