There is a lot of small events organized too and I could enjoy a concert of taiko and one of koto (picture above). Zenzai (sweet soup of beans and mochi), dango (caramelized pasted rice), amazake (sweet sake), ... are here to help you to fight the coldness of night.
Right after the lightup of Gion starts in the same area the one of Kiyomizudera temple. Actually the gate of this temple was already magnificently illuminated during the lightup of Gion. From March 29th to April 10th (18:30-21:30) the whole temple will be enlighted.
If you're looking for others places where to enjoy cherry blossom at night or beautiful enlighted monuments in Kyoto I would recommend you to follow this link : http://www.kyotojoho.co.jp/english/e2008_04/04-hl.html