I'm trying to say that someone will be participating in a golf event.
Steve Jones **will be participating in the PGA..... **
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'Take part in' would be my go-to alternative. This brings the same connotation that 'participating in' has, in that it assumes you will be directly involved in the event/activity, instead of just spectating.
Referring to the comments above 'take part in' could apply to a player, caddy, and official. If you wanted to specify a supporting role such as a caddy or official, you could also use 'helping out in' or simply 'supporting in'.
Any additional information might help us find the more specific term.