IETF is the organization most involved in creating Internet standards and OMG is the organization most involved in object technology standards. IETF meets three times a year. Most of the work is done off-line.
Discussions is very active.
Prepare to be swamped. IETF meetings mostly review deltas on drafts and issues related. So if one attends IETF meetings, it is important to read relevant documents, comment over email on issues, designs, etc. before the meeting. Meetings mainly provide authors a gauge on how many people care about a topic and believe the work is heading in the right direction. OMG has perhaps a half to a fifth as many specifications it is producing or has produced.