I just made some corrections on grammar and I heighted them for you. Everything else seems to be alright.

The rehearsal of "Golden Rice Field", a part of performances prepared for the Opening  and Closing Ceremony of the 25th Sea Game to be held in Vientiane, the capital of Laos  in late 2009, is  being continuously rehearsed at Nongbon High School and 65% ready.
           Mr. Phoumy Phomkeona, Head of Nongbon High School, also the director  responsible for 'Golden Rice Field' and "Keua Kao Gad" performances which will be used at Opening and Closing Ceremony of 25th Sea Game had confirmed in an interview that  the "Golden Rice Field" performance is being continuously rehearsed already  for 6 weeks at the front playing ground of Nong bon High School, with  410 students, 10 reserves,  as well as 20 leading performers from  Central Artists Troupe  are in participation. With respect to the Keua Kao Gad performance, the rehearsal will start soon.  During October to November, the two performances will participate in grand rehearsal at National Stadium at Km 16, Saythani District.
             Mr. Phoumy had further stated that: the rehearsals faced difficulties during initial period such as: shortage of vehicle to accommodate students, performers. Therefore, the participating students mostly have no rider license and sent to school by their parents with most of students were on time, but few students were late.
               
              The rehearsal is being conducted every Saturday from 8:00 AM in morning session and 1:00 PM-6:00 PM for afternoon session during the initial period. For the grand rehearsal period, the Sea Games Organising Committee will provide vehicles for picking up and sending students to their home to ensure smooth rehearsals and to assure best and brilliant performance for the Opening and Closing Ceremony of the 25th Sea Game.

You use adverb concurrently with verb or adjective but not with noun. 

More corrections added...

Anonymous wrote:

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I just made some corrections on grammar and I heighted (highlighted?) them for you. Everything else seems to be alright.

'Golden Rice Field', an item to be performed for the opening and closing ceremonies of the 25th SEA Games to be held in Vientiane, the capital of Laos, in late 2009, is being rehearsed at Nongbone High School and 65% ready.

Mr. Phoumy Phomkeona, Head of Nongbone High School and director of the 'Golden Rice Field' and 'Keua Kao Gad' (dance? mass display?) items to be performed for the opening and closing ceremonies of the 25th SEA Games confirmed in an interview that rehearsals for the 'Golden Rice Field' item have been held at the front playing ground of Nongbone High School for the past six weeks, with 410 students, 10 reserves, as well as 20 leading performers from the Central Artistes Troupe involved. As for the 'Keua Kao Gad' item, rehearsals will start soon. Performers for these two items will participate in a grand rehearsal at the National Stadium at Km 16, Xaythany District, sometime in October or November.

Mr. Phoumy further stated that difficulties faced during the initial period while staging the rehearsals included a shortage of vehicles to transport students and performers. Most of the participating students have no driving license and have to be ferried to rehearsal venue by their parents. Most of the students were on time, but a few were late.

Rehearsals are being conducted every Saturday from 8:00 AM for the morning session and from 1:00 PM-6:00 PM for the afternoon session during the initial period. For the grand rehearsal period, the SEA Games Organising Committee will provide vehicles for picking students up and sending them home to ensure that rehearsals proceed smoothly and that the students give their best and most brilliant performances for the opening and closing ceremonies of the 25th SEA Games.

You use adverbs concurrently with verbs or adjectives but not with nouns.

 

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