KAMPALA, Uganda—Ugandan opposition figure Bobi Wine is calling for peaceful protests in the aftermath of presidential elections, charging that electoral authorities are “grappling with forged results” that showed a victory for President Yoweri Museveni. Wine, a singer and lawmaker whose real name is Kyagulanyi Sentamu, spoke on Tuesday, the day after police warned in a statement that some opposition politicians were planning “nationwide violent demonstrations and riots beginning with Kampala,” the capital. That statement warned that police had “deployed strategically to counter these illegal acts.” Wine on Tuesday asserted that the East African country’s constitution allows peaceful protests. “Ugandans must now rise to the occasion and resist Museveni and his regime of blood,” he said. “As we have been saying, we are nonviolent and lawful. Our philosophy stands firm. People power is stronger than the people in power.” Museveni was declared the winner of the Jan. 14 elections with 58 …