Have solved all the clues. I think that 35A, 25A and 16A (in that order) combine to give the relevant activity and 11A is the relevant name, so the activity is clear (it takes place at a particular time and the puzzle's title is "Timely II"). Am baffled by the unclued lights around the perimeter ("three trios (...) each trio combining to suggest the same word"). The first trio is S??L??G, MA?E, ?N??E?, which has lots of possibilites. The second trio is S?I?E, ?TTE??A?T, ?ES. There are 38 (!) possibilities for S?I?E. The last two words could be ATTENDANT, YES, but this doesn't help much. The third trio starts with M?U?D: there are three possibilities, of which MOULD seems the most likely. The second word is ??P?O?E?, for which there are 68 (!!) possibilities and the last word is E?ER, and is therefore probably EVER.