Discover page "All upcoming" filter shows 0 events even when upcoming events exist

**What happens:** On the Discover page, selecting the "All upcoming" filter returns 0 results, even when upcoming events exist in the system. **Evidence (same user, same session):** - The **home page** shows the upcoming event "Summer Crossover Picnic & Potluck" (Jun 14, Parc Laurier, Montreal). - The **Discover** page with "All upcoming" selected shows: "0 results — Nothing in view here." **Expected:** events visible on the home page should also appear under Discover → All upcoming. **Where:** Discover page, "All upcoming" filter chip. Worth checking "This week" and "This month" with the same event. **Repro:** 1. Sign in. 2. Open the home page — confirm at least one upcoming event card is visible. 3. Navigate to Discover. 4. Select "All upcoming". 5. Result list shows 0.