According to @alice_und_bob, the Vienna Bitcoin Pizza Day 2025 event hosted by @validvent attracted 200-300 crypto enthusiasts, signaling robust community engagement and growing interest in Bitcoin. The mention of potential Polkadot sponsorship for next year suggests increased integration of major blockchain projects into grassroots events, which could stimulate local trading activity and enhance network visibility. Source: @alice_und_bob on Twitter, May 22, 2025.