Yes, Daylight Saving Time goes into effect this weekend (moved up from the usual first week in April), but that's not the issue here...
Some of the early flyers and emails advertised the Surrey Critical Mass first ride as meeting at 1:30pm and leaving at 2pm on the 24th. Well, we found out soon after getting the word out that there is a Vancouver Area Cycling Coalition (VACC) meeting that afternoon from noon until 3pm, right across the street at the North Surrey Recreation Centre (10275 - 135 Street, meeting room #2).
We didn't want to compete with that (and we wanted interested VACC members to be able to join us) so we moved our meeting time to 3:30pm to give them enough time to gather themselves and their panniers.
So, yes, 3:30pm is the meeting time (not 1:30pm) and this is reflected in the updated posters and flyers.
Chainring clock image above from Resource Revival