1) Arrival 2) Arriver 3) Bandwagon joiner 4) Comer 5) Fashionable one 6) Fashionable partygoer 7) Fashionable sort 8) One jumping on the bandwagon 9) Pest at a concert 10) Recent arrival 11) Recent convert 12) Show disrupter, possibly 13) Someone who arrives late 14) Tardy arriver 15) Tardy individual 1) Standee 
[n] - someone who arrives late
noun someone who arrives late