BOSTON — Mayor Michelle Wu will not be attending the annual St. Patrick's Day Breakfast in South Boston on Sunday.

Her office says she has a scheduling conflict. She'll be at church with her family.

This would be unremarkable except for the fact that Wu has attended every single St. Patrick's Day breakfast since winning election in 2021 — and the host of the event, state Senator Nick Collins, happens to be the man she has spent the better part of two years trying to politically destroy.

The backstory is not subtle.

Wu has been lobbying the state Legislature since 2024 to approve a property tax shift that would move more of Boston's tax burden onto commercial real estate. She warned that without it, residential homeowners would face double-digit tax increases.

Then came the political warfare.

Both Collins and Brownsberger have since drawn challengers. In Brownsberger's case, the challenger is Daniel Lander — a senior aide to Wu who launched his campaign from inside the mayor's office.

Two candidates have filed paperwork signaling they could run against Collins. One of them, Latoya Gayle, attended Wu's inauguration party in January. Gayle's campaign manager, Maccon Bonner, previously worked for Boston City Councilor Sharon Durkan, one of Wu's closest allies on the council.

To summarize: Wu targeted Collins by name on social media, blamed him for raising property taxes, and now has political allies challenging him from multiple directions.

And she can't make his breakfast because she has church.

Wu has attended every St. Patrick's Day breakfast since her election. She even participated in the virtual version in 2021, during which Collins suggested in a social media post that Wu, then a mayoral candidate, wasn't "from Boston."

At her first in-person appearance as mayor, Wu alluded to her rocky start dealing with snowstorms and labor disputes: "I'm getting used to dealing with problems that are expensive, disruptive, and white," she joked. "I'm talking about snowflakes, snowflakes, snowstorms … snowflakes."

Her predecessor, Martin Walsh, attended every breakfast during his tenure. The event was only canceled once — in 2020 at the onset of the pandemic.

This year's breakfast will be held at Ironworkers Local 7 Union Hall in South Boston at 9 a.m. Sunday. The mayor will be at mass.