Complex sentence: Grand opening and closing ceremonies were only some of the attractions.There were various technical competitions, ranging from coding competitions to a DJ mixing one, and also a plethora of cultural events, like poster making and dance competitions.
Split into simpler sentences: Grand opening and closing ceremonies were only some of the attractions. We had various technical competitions, ranging from coding competitions to a DJ mixing one, and also a plethora of cultural events, like poster making and dance competitions.