Celebrations began at the BJP headquarters here on Monday with workers dancing to the beat of drums, bursting firecrackers and shouting slogans hailing Prime Minister Narendra Modi, as the party was set to win the Gujarat and Himachal Pradesh elections.BJP workers reached the party's central office here at Ashoka Road in groups from early afternoon after the election trends clearly showed that the party is set to retain Gujarat for the fifth time, and is poised to wrest Himachal Pradesh from the Congress.The party had made arrangements for coverage of the results and had erected a tent for mediapersons to take reactions of party leaders.